Last updated: June 27, 2026. Written by Dean Fankhauser. The source list below uses official government or primary law sources for Canada, Italy, Ireland, Portugal, Spain, Austria, Germany, Poland, Greece, Malta, and the UK. This is route diagnosis, not legal advice; final eligibility depends on the filing authority and the document chain.
Best route by applicant profile
Start here when you are deciding whether a file is worth researching. The same ancestor can produce a strong, weak, or impossible case depending on citizenship-loss rules and registration timing.
| Applicant profile | Best first check | Usually promising when | Usually weak when | Next action |
|---|---|---|---|---|
| Citizen parent | Parent citizenship at your birth or adoption | The parent was a citizen and the country's law allowed transmission to a child born in your facts. | The parent had lost citizenship, missed a registration step, or could not transmit to children born abroad. | Order the parent's proof of citizenship plus your long-form birth/adoption record. |
| Irish-born grandparent | Foreign Births Register | The grandparent was born on the island of Ireland and the generation chain is documented. | You need to pass citizenship onward but registration happened after the next generation was born. | Build the FBR document pack and check onward-transmission timing. |
| Portuguese grandparent | Original Portuguese nationality and effective-connection rules | The grandparent was an original Portuguese citizen and did not lose nationality. | The file relies on vague family connection, missing civil registration, or old Sephardic-route assumptions. | Separate child, grandchild, and great-grandchild routes before gathering records. |
| Italian parent or grandparent | 2025 narrowed eligibility and transition rules | The case fits the current parent or Italian-born parent/grandparent limits, or a valid transition/court route applies. | The ancestor naturalized abroad before the next generation was born, or the line is too remote for current administrative filing. | Map naturalization dates before spending on translations. |
| Nazi-persecution family history | Germany or Austria restitution route | The ancestor fits the official persecution/loss category and the descent chain can be proved. | There is family history but no evidence of status, loss, persecution category, or direct descent. | Collect persecution/loss records before ordinary civil certificates. |
| Spanish exile or loss category | Democratic Memory Law category and filing status | A covered DML category was filed or appointment-protected within the allowed window. | The case is just a Spanish grandparent story with no covered category or preserved filing path. | Check the consulate's current treatment before assuming the route remains available. |
| Commonwealth citizen with UK-born grandparent | UK Ancestry Visa eligibility | The person is a Commonwealth citizen, 17 or older, can work, and wants UK residence first. | The goal is immediate British citizenship by descent. | Treat this as a visa-to-settlement route, not citizenship by descent. |
Country eligibility matrix
Use this table to see what to verify first. It is not a list of every theoretical ancestry rule.
| Country | Generation / route | Registration or filing route | Residence or language | Core blocker | Timing / status in 2026 | Source to check first |
|---|---|---|---|---|---|---|
| Ireland | Irish-born parent or Irish-born grandparent. | Foreign Births Register for most grandparent cases. | No residence requirement for the FBR route. | Onward transmission can depend on registration before the next generation is born. | Open; processing time depends on FBR workload and document quality. | Ireland Foreign Births Register. |
| Italy | Parent or Italian-born parent/grandparent under narrowed 2025 rules; some transition and court routes remain fact-specific. | Consulate, municipality, or court depending on facts. | Usually no residence for a qualifying recognition case. | 2025 limits, foreign naturalization before the next birth, pre-1948 maternal line, and consular backlog. | Decree-Law 36/2025 entered into force on 29 March 2025 and was converted by Law 74/2025. | Gazzetta Ufficiale DL 36/2025. |
| Canada | Canadian parent; some second-generation-or-later cases affected by the first-generation limit. | Proof of citizenship. | No applicant residence; future transmission by a Canadian parent born/adopted abroad generally needs that parent to show three years in Canada before the child's birth/adoption. | Parent physical-presence evidence and date-of-birth/adoption facts. | Bill C-3 is in force from 15 December 2025. | IRCC 2025 citizenship-rule update. |
| Portugal | Child, qualifying grandchild of an original Portuguese citizen, or great-grandchild facilitated naturalization route. | Nationality registration/acquisition or naturalization depending on route. | Great-grandchildren still need at least five years of legal residence in Portugal; grandchild route has different nationality conditions. | Original-nationality proof, effective connection, criminal/security checks, and civil-registration gaps. | Lei Organica 1/2026 in force from 19 May 2026; Sephardic route closed to new applicants. | Diario da Republica LO 1/2026 and Portugal Ministry of Justice. |
| Spain | Democratic Memory Law categories, not a generic grandparent route. | Nationality by option through covered category and consular process. | No ordinary residence requirement for DML option cases. | Covered category, exile/loss proof, filing deadline, and appointment preservation. | BOE law gave two years from 21 Oct 2022, with possible one-year extension; in 2026, treat fresh unfiled cases as closed unless a consulate confirms preserved filing. | BOE Law 20/2022. |
| Germany | German parent or restitution/declaration route for covered descendants. | Citizenship procedure through competent authority. | Usually no residence for qualifying descent/restoration routes. | Historic loss rules, discrimination rules, persecution evidence, and document gaps. | Open, but legal route depends heavily on dates and loss category. | German Federal Foreign Office: German Citizenship. |
| Austria | Austrian parent or direct descendants of people persecuted under National Socialism. | Declaration route for persecuted persons and descendants where conditions fit. | No residence requirement for the persecuted-descendant declaration route. | Strict dual-citizenship rules outside exceptions, parent status, and restitution evidence. | Open, strict outside official restitution categories. | Austrian Foreign Ministry. |
| Poland | No simple generation cap if Polish citizenship legally continued through the line. | Confirmation of possession or loss of Polish citizenship. | No residence requirement for confirmation cases. | Foreign naturalization, military service, old loss rules, border changes, and archive gaps. | Open but evidence-heavy. | Polish confirmation guidance. |
| Greece | Greek parent, or Greek-origin cases where registration/naturalization conditions fit. | Recognition, municipal registration, or naturalization depending on facts. | Parent descent is not an ordinary residence question; Greek-origin naturalization has its own route requirements. | Parent-generation status, municipal records, transliteration, and archive delays. | Open but often slow and document-sensitive. | Mitos: automatic acquisition by child of a Greek citizen and Mitos: naturalisation of expatriates residing abroad. |
| Malta | Maltese parent or direct-line descendant where registration conditions fit. | Registration under the Maltese Citizenship Act. | Depends on the statutory registration route. | Generation facts, civil-status chain, and route-specific conditions. | Open, statute-specific. | Maltese Citizenship Act. |
| United Kingdom | UK-born grandparent only for eligible Commonwealth citizens under the visa route. | UK Ancestry Visa. | Yes: residence route first, then settlement/naturalization later. | Commonwealth nationality, age, work intention, and settlement timeline. | Open residence route; not citizenship by descent. | GOV.UK Ancestry Visa. |
| Country | Best for | Watch out | Official next step |
|---|---|---|---|
| Ireland | Irish-born parent or grandparent cases with a complete civil chain. | Onward transmission can fail if Foreign Births Register timing is too late for the next generation. | Check the Foreign Births Register rules and gather long-form civil records. |
| Italy | Parent or Italian-born parent/grandparent cases that still fit the narrowed 2025 rules. | Foreign naturalization, pre-1948 maternal-line issues, transition rules, and consular backlogs. | Test the file against Decree-Law 36/2025 before ordering a full document pack. |
| Canada | People affected by the first-generation limit, plus future parent-child transmission cases. | Parent physical-presence evidence is the practical blocker for future children born or adopted abroad. | Use the IRCC update to decide whether proof of citizenship or physical-presence evidence comes first. |
| Portugal | Children and qualifying grandchildren of original Portuguese citizens. | Great-grandchildren are not automatic descent; the 2026 route is facilitated naturalization with residence. | Separate child, grandchild, and great-grandchild routes before collecting records. |
| Spain | Covered Democratic Memory Law categories with a filed or preserved consular path. | A Spanish grandparent alone is not enough, and fresh 2026 cases may be closed. | Confirm the consulate's current filing or appointment-preservation rule. |
| Germany or Austria | Restitution cases linked to persecution, discriminatory loss, or covered descendant categories. | Family stories need status, loss, persecution, and descent evidence. | Start with the federal citizenship authority or Austrian Foreign Ministry route notes. |
| Poland | Families where Polish citizenship may have continued through the line. | Foreign naturalization, military service, old loss rules, border changes, and archive gaps. | Run a possession-or-loss confirmation analysis before treating the case as simple descent. |
| Greece or Malta | Parent/direct-line files where registration or statutory conditions fit. | Civil registration, transliteration, municipal records, and route-specific conditions. | Check the ministry guidance or citizenship act before deciding the filing route. |
| United Kingdom | Eligible Commonwealth citizens with a UK-born grandparent who want UK residence. | It is not automatic British citizenship by descent. | Use GOV.UK's Ancestry Visa rules and plan the settlement timeline. |
Case-breaker diagnostic tree
Most failed cases do not fail because the ancestor did not exist. They fail because citizenship could not legally transmit, or the applicant cannot prove that it did.
| If this is true | Ask next | Evidence to collect | Likely outcome |
|---|---|---|---|
| The ancestor naturalized abroad. | Did naturalization happen before the next generation was born? | Naturalization certificate, petition, oath, or certificate of non-existence. | If yes, the chain may have broken unless a restitution or exception route applies. |
| A child was born abroad. | Was foreign-birth registration required before that child could transmit citizenship onward? | Foreign birth registration certificate, consular record, or registry extract. | A late registration can recognize one person but fail to pass citizenship to children already born. |
| The line passes through a woman under older law. | Did the law at the time allow maternal transmission? | Birth and marriage dates, nationality law text, and court-route assessment. | The case may need a court or restitution route instead of ordinary administrative filing. |
| There was adoption, legitimation, or non-marital parentage. | Did the country's law treat that legal parent-child relationship as transmissible? | Adoption orders, amended birth records, recognition documents, and court orders. | Possible, but only if legal parentage is recognized under the route's rules. |
| Names or dates differ across records. | Can the same person be proved without relying on explanation alone? | Amended certificates, name-change orders, archive letters, affidavits, and certified translations. | Fix before filing; inconsistencies cause avoidable delays and refusals. |
| The route is deadline-sensitive. | Was there a valid filing, appointment, or preserved consular process before the cutoff? | Consular appointment confirmation, filing receipt, email evidence, and official deadline page. | Do not spend on a full pack until the filing window is confirmed. |
Changed-law routes: exact action notes
| Route | Date or rule | Official source to verify | What to do now |
|---|---|---|---|
| Italy | Decree-Law 36/2025 was published on 28 March 2025, entered into force on 29 March 2025, and was later converted by Law 74/2025. | Gazzetta Ufficiale: Decreto-Legge 28 marzo 2025, n. 36. | Before ordering a full pack, test whether the file fits the narrowed parent or Italian-born parent/grandparent route, a transition rule, or a court path. |
| Canada | IRCC states Bill C-3 is in effect from 15 December 2025. Future transmission by a Canadian parent born or adopted abroad generally turns on three years in Canada before the child is born or adopted. | Immigration, Refugees and Citizenship Canada: 2025 citizenship-rule update. | Separate pre-15 December 2025 affected people from future-child or adoption cases, then gather parent physical-presence evidence. |
| Portugal | Lei Organica 1/2026 is in force from 19 May 2026. It closed the Sephardic route to new applicants and added a great-grandchild facilitated naturalization path with five years of legal residence. | Diario da Republica and Portugal Ministry of Justice nationality-law update. | Do not describe great-grandchildren as automatic descent. Decide whether the file is child, grandchild, or great-grandchild naturalization before advising. |
| Spain | Law 20/2022 entered into force on 21 October 2022. The Democratic Memory Law nationality option had a two-year filing window, with a possible one-year Council extension. | Boletin Oficial del Estado: Law 20/2022. | In 2026, treat fresh unfiled DML cases as closed unless the relevant consulate confirms a preserved appointment or filing rule. |
| Ireland | Foreign Births Register timing affects onward transmission. | Department of Foreign Affairs, Ireland: Foreign Births Register. | If children or future children are part of the goal, verify whether the relevant parent needed to be registered before the child's birth. |
Country notes
Italy
Italy still matters, but it is no longer a lazy answer for every Italian ancestor. Start with the Gazzetta Ufficiale text for Decree-Law 36/2025, then map naturalization dates and decide whether the file belongs with a consulate, municipality, or court. Pre-1948 maternal-line cases and transition-rule cases need separate handling.
Ireland
Ireland is one of the strongest practical routes because the Foreign Births Register gives a clear path for many Irish-born grandparent cases. The competitiveness detail is onward transmission: if your child is the next applicant, registration timing can be decisive.
Canada
IRCC's December 15, 2025 update makes Canada a serious route for some people caught by the first-generation limit. For future cases, the practical evidence problem is the Canadian parent's three years in Canada before the child was born or adopted.
Portugal
Portugal needs exact route naming after Lei Organica 1/2026. Children, grandchildren, and great-grandchildren are not the same route. The Ministry of Justice nationality-law update confirms the new rules; great-grandchildren should be framed as facilitated naturalization with five years of legal residence, not as direct citizenship by descent.
Spain
Spain's Democratic Memory Law is a repair/option route for covered categories, not a normal grandparent route. The law entered into force on 21 October 2022 and its nationality option was time-limited. New 2026 enquiries should first prove a preserved filing path before building a full document set.
Germany and Austria
Germany and Austria are often strongest where the family history involves Nazi persecution or discriminatory loss rules. Germany's Federal Office of Administration and Austria's persecuted-persons descendant route should be checked before treating the file as ordinary descent.
Poland, Greece, and Malta
Poland is usually a continuity question, so the official confirmation of possession or loss process is central. Greek-origin files can turn on recognition, municipal registration, or naturalization conditions. Malta sits in the Maltese Citizenship Act and needs route-specific registration analysis.
Applicant scenarios
Other notable routes to screen
The core matrix above covers the routes most applicants ask us about first. These additional countries are worth screening when the family history points there, but they need country-specific review before you treat them as a real filing path.
| Country | Why it may matter | First official source to check | Screening caution |
|---|---|---|---|
| Croatia | Croatian origin, emigrant, and descendant facts can matter. | Croatian Ministry of Foreign and European Affairs. | Do not assume every remote Croatian ancestor creates a modern filing path. |
| Slovenia | Slovenian origin, parentage, and naturalization categories can matter. | Republic of Slovenia citizenship topic. | Route choice depends on the statutory category, not just surname or heritage. |
| Lithuania | Restoration of Lithuanian citizenship can be relevant for some former-citizen family lines. | Lithuanian Migration Department. | Restoration and dual-citizenship exceptions are evidence-heavy. |
| Luxembourg | Luxembourg nationality has recovery and option routes, with historical-route deadlines to check carefully. | Guichet.lu nationality guidance. | Some old recovery windows have closed; verify the route before ordering records. |
| Czechia | Czech citizenship can involve declaration, descent, or former-citizen facts. | Czech Ministry of the Interior. | Former Czechoslovak status and later loss rules can control the answer. |
| Hungary | Hungarian ancestry may matter for simplified naturalization, usually with language and other conditions. | Hungarian consular simplified naturalization guidance. | This is not a pure document-only descent filing; language and legal conditions can be decisive. |
| Bulgaria | Bulgarian origin and citizenship-law categories can be relevant for some applicants. | Bulgarian citizenship law. | Use the official law and consular process before treating the route as straightforward. |
Applicant scenarios
Use these examples as screening patterns, not legal conclusions.
| Scenario | First question | Likely direction | Why |
|---|---|---|---|
| Applicant has an Irish-born grandmother and wants citizenship for future children. | Was the applicant registered on the Foreign Births Register before the child is born? | Promising for the applicant if the civil chain is complete; onward transmission needs timing checks. | Ireland can be clear for grandparent cases, but passing citizenship to the next generation can depend on registration timing. |
| Applicant has an Italian great-grandfather and no parent or grandparent born in Italy. | Does a transition or court route still apply after the 2025 law changes? | Weak until the post-2025 route is proven. | Italy is narrower than old generic jure sanguinis summaries suggest. |
| Applicant is a Portuguese great-grandchild with no recent legal residence in Portugal. | Is this being treated as descent or facilitated naturalization? | Not an automatic descent case. | The 2026 great-grandchild path is framed around facilitated naturalization and five years of legal residence. |
| Canadian parent was born abroad and wants to pass citizenship to a future child born abroad. | Can the parent prove three years in Canada before the child's birth or adoption? | Possible only if the physical-presence evidence supports it. | For future transmission, parent physical presence is the practical evidence question. |
| Applicant has a Polish grandparent but the family later lived under changing borders. | Did Polish citizenship legally continue through each generation, or was it lost under old rules? | Promising only after continuity is proven. | Polish cases often turn on archives, foreign naturalization, military service, and historic loss rules. |
| Applicant has a Spanish grandparent and only discovers the route in 2026. | Was there a covered Democratic Memory Law category and a preserved filing or appointment before the cutoff? | Weak unless the consulate confirms a preserved path. | Spain's DML was time-limited; a Spanish grandparent story is not enough by itself. |
Documents you usually need
| Document | Why it matters | Common issue |
|---|---|---|
| Applicant birth/adoption certificate | Connects the applicant to the parent generation. | Short-form records may omit parents or legal parentage details. |
| Parent and grandparent birth certificates | Builds the civil chain back to the qualifying ancestor. | Names, places, and dates often differ across countries. |
| Marriage, divorce, adoption, legitimation, and name-change records | Explains legal parentage and identity continuity. | Missing middle documents can break the chain even when the ancestor qualifies. |
| Naturalization or non-naturalization evidence | Shows whether citizenship was lost before transmission. | Applicants often search the wrong court, archive, country, or date range. |
| Foreign-birth or consular registration proof | Shows whether a registration step was completed in time. | Late registration may not help children already born. |
| Apostilles, legalizations, and certified translations | Makes foreign public documents usable abroad. | Translator and legalization rules differ by authority. |
| Consular appointment or filing evidence | Protects deadline-sensitive cases. | Screenshots are weaker than receipts, appointment confirmations, and official emails. |
Step-by-step process
| Stage | What to do | Do not skip |
|---|---|---|
| 1. Build the family line | Write the chain from applicant to ancestor, with birth, marriage, adoption, naturalization, and death dates. | Loss and registration dates. |
| 2. Pick the legal route | Classify the case as descent, option, declaration, restitution, facilitated naturalization, or residence route. | A generic ancestry label is not enough. |
| 3. Run the breaker checks | Test naturalization, registration timing, maternal-line rules, adoption/legitimation, and deadline issues. | Do this before ordering expensive translations. |
| 4. Order the records | Collect long-form civil, citizenship, naturalization, and archive documents. | Document format and issuing authority. |
| 5. Fix discrepancies | Resolve name/date mismatches, apostilles, legalizations, and certified translations. | Authority-specific translator rules. |
| 6. File and preserve proof | Submit through the correct consulate, ministry, court, civil registry, or online process. | Appointment receipts and filing evidence. |
| 7. Register and plan onward transmission | After recognition or approval, complete any civil-registration or passport step. | Whether children can inherit only after registration. |
Timeline, costs, and effort
Citizenship by descent is often cheaper than investment migration, but it is rarely effortless. The expensive part is usually not the headline government fee; it is retrieving, correcting, legalizing, and translating the document chain.
| Route | Typical timing pressure | Main cost driver | Practical budget note |
|---|---|---|---|
| Ireland FBR | Processing depends on FBR workload and document quality. | Civil certificates, duplicate records, and apostilles/translations for non-Irish records. | Usually less legal-heavy than complex continuity cases if the chain is clean. |
| Italy recognition | Consulate queues, municipality handling, or court timetable can dominate. | Certified translations, apostilles/legalizations, naturalization searches, and legal fees for court routes. | Do the naturalization-date check before paying for a full translated file. |
| Portugal nationality | Registry processing and route classification matter; great-grandchild naturalization adds residence planning. | Civil-registration corrections, translations/legalizations, and residence costs where naturalization is required. | The expensive mistake is treating child, grandchild, and great-grandchild files as one route. |
| Canada proof / transmission | Proof processing and parent physical-presence evidence gathering. | Document retrieval, parent records, and proof of days in Canada where the rule requires it. | For future children born abroad, evidence can matter more than the application form. |
| Spain DML | Deadline and consular appointment preservation are the first issue. | Apostilles, translations, civil records, and proof of covered category. | Confirm the filing path before spending on a complete pack in 2026. |
| Poland confirmation | Archive and legal continuity analysis can take months or longer. | Archive searches, translations, military/naturalization checks, and specialist legal analysis. | Budget for proof of continuity, not just birth certificates. |
| Germany / Austria restitution | Historical-evidence collection and authority processing. | Archive records, persecution/loss evidence, translations, and specialist review for complex categories. | Often strong when the restitution category is clear, but weak if the family story lacks documents. |
| UK Ancestry Visa | Visa, residence, settlement, then possible naturalization timeline. | Visa fee, healthcare surcharge, residence maintenance, and later settlement/naturalization costs. | This is a residence path first, not a cheap instant-passport route. |
| Workstream | Typical planning range | What controls it |
|---|---|---|
| Route diagnosis | 1 to 3 weeks | Known family facts, naturalization dates, and whether the route is open. |
| Record retrieval | 1 to 6+ months | Archive access, civil registry speed, foreign records, and missing certificates. |
| Corrections, apostilles, and translations | 2 to 8+ weeks | Country of issue, translator requirements, amendment process, and certificate volume. |
| Consular, registry, or ministry processing | Months to years | Country, consulate backlog, appointment availability, and file complexity. |
| Court or restitution route | Often 1+ year | Court schedule, legal filings, historical evidence, and appeal risk. |
Related routes that are not citizenship by descent
| Route | Basis | Typical fit | Main limitation |
|---|---|---|---|
| Ordinary naturalization | Residence and integration | People willing to live in the country long enough to qualify. | Takes years and may require language, residence, clean-record, and integration evidence. |
| Residency by investment | Qualifying investment | Investors seeking residence first and possible citizenship later. | High cost, due diligence, and no automatic passport outcome. |
| Citizenship by investment | Donation or investment in a CBI country | Applicants seeking faster citizenship without ancestry. | High cost, reputation scrutiny, and changing program rules. |
| UK Ancestry Visa | Commonwealth citizen with a UK-born grandparent | Eligible Commonwealth citizens seeking a UK residence path. | It is a visa that can lead to settlement; it is not automatic British citizenship by descent. |