Prove citizenship you already hold
Some people were citizens from birth but still need a certificate, registration, or civil record to prove it.
Citizenship by descent
Could citizenship have passed through your family?
Possibly. The answer depends on who was a citizen, when each child was born, and what happened between those dates.
- Follow citizenship from one generation to the next
- Check registrations, naturalizations, losses, and family events
- Find the records that can prove each important fact
Ask about my family line
We identify possible routes and evidence gaps. Only the relevant authority decides citizenship.
What may be the right next step?
Citizenship by descent is not one process. First work out what you are trying to prove or obtain.
Register through a parent or grandparent
Some countries provide a registration route, often with a generation limit or an important deadline.
Restore a former citizenship
A former citizen may have a restoration route. It does not always extend automatically to descendants.
Apply through ancestry
Some countries offer facilitated naturalization. These routes may require language, residence, or proof of ties.
The family connection starts the review. It does not decide the result by itself.
How do you check the family line?
Start with the ancestor. Then move forward one generation at a time.
The ancestor
Where to start
Was this person actually a citizen?
Check: Birth and citizenship records, passports, naturalization files, or official archives.
The next child
The first handoff
Was the ancestor still a citizen when this child was born?
Check: The birth date, legal parentage, and any earlier loss or naturalization.
Your parent
The link to you
Was your parent a citizen when you were born?
Check: How and when citizenship began, plus any later loss.
You
The next step
Are you proving, registering, restoring, or applying?
Check: The family records and procedure that match your situation.
Which facts should you write down first?
You do not need every family record on day one. Start with five questions.
- Who is the closest ancestor connected to the country?
- Was that person a citizen, or only born or resident there?
- When did citizenship begin or end for each generation?
- Was each parent-child relationship legally established at the required time?
- Which official record could prove each important event?
Which countries are we focusing on first?
Start with Ireland, Italy, Germany, Poland, Portugal, Romania, Croatia, Canada, France, Austria, Hungary, Greece, Czechia, Slovakia, Lithuania, or Latvia, or compare the other citizenship-by-descent systems we are researching.
Ireland
Citizenship from birth, Foreign Birth Registration, and discretionary Irish-descent cases.
Explore IrelandItaly
Citizenship held from birth, the 2025 restrictions, protected filings, naturalization loss, and historical court cases.
Explore ItalyGermany
Ordinary descent, historical discrimination remedies, and restitution connected to Nazi persecution.
Explore GermanyPoland
Confirmation of existing status, personal restoration, and historical loss, military, domicile, and border review.
Explore PolandPortugal
Nationality of origin through a parent or qualifying grandparent, plus separate family, residence, reacquisition, and historic-status routes.
Explore PortugalRomania
Citizenship from a Romanian parent, Article 10 for former citizens through grandchildren, and Article 11 after qualifying loss through great-grandchildren.
Explore RomaniaCroatia
Citizenship by origin, pre-1991 determination, Article 11 naturalization for qualifying emigrants and descendants, and Article 16 review.
Explore CroatiaCanada
Proof of citizenship through a Canadian parent, historical family-status review, the separate adoption grant, and the connection rule for some later events.
Explore CanadaFrance
Status from a French parent, CNF proof, the Article 30-3 evidence bar, historical loss, and former-territory review.
Explore FranceAustria
Citizenship from birth, formal status determination, citizenship proof, historical loss, and section 58c notification review.
Explore AustriaHungary
Existing citizenship and verification, Section 5/A declarations, simplified naturalisation, re-naturalisation, and historic territory review.
Explore HungaryGreece
Existing citizenship and municipal proof, Article 14 declarations, Article 26 decisions, recognition, adoption, Article 10, and territory review.
Explore GreeceCzechia
Existing status from a Czech parent, Section 31 declarations after documented loss, and Czech-Slovak or postwar history review.
Explore CzechiaSlovakia
Existing status from a Slovak parent, the prospective discretionary Section 7(8) descendant grant, and Czechoslovak or residence-procedure review.
Explore SlovakiaLithuania
Citizenship from birth, Article 9 reinstatement through a great-grandchild, separate Article 7 dual-citizenship exceptions, and the Article 10 Lithuanian-origin route.
Explore LithuaniaLatvia
Citizenship through a Latvian parent, separate 17-June-1940 citizen and exile routes, and the cumulative Latvian or Liv route.
Explore LatviaWhat happens during a review?
The steps are straightforward. The family history may not be.
- 01
Choose the country
Start with the country connected to your parent, grandparent, or earlier ancestor.
- 02
Put the events in order
List every important birth, marriage, registration, naturalization, loss, and adoption.
- 03
Work out which process may apply
Separate citizenship held from birth from registration, restoration, or discretionary naturalization.
- 04
Request the useful records
Look for the documents that prove the important facts. Do not order everything before you know why you need it.
What can ByLineage help you organize?
ByLineage is an Immileads service. We turn a family story into a clear set of people, dates, questions, and documents.
The review can include
- A map of the possible citizenship process
- The important dates and events in each generation
- A list of missing or conflicting records
- The documents to look for and the authority that may hold them
- A referral to an independent specialist where legal review is needed
What the review does not promise
- An official decision that you are a citizen
- Approval by a registry, ministry, consulate, or court
- A processing time controlled by a public authority
- That one surname, birthplace, passport, or family tree proves the whole case
Common questions
Start with the short answer. Then check the country-specific rule.
What is citizenship by descent?
It generally means citizenship connected to a citizen parent or ancestor. But countries use different legal processes. You may be proving citizenship held from birth, registering, restoring a former status, or applying through ancestry.
Is one citizen grandparent enough?
It depends on the country. Some countries have a direct grandparent process. Others require citizenship to pass through your parent first.
Is there a maximum number of generations?
Sometimes. Some laws stop at a parent, grandparent, or great-grandparent. Other systems have no fixed number but require an unbroken citizenship chain.
Do I need to live in the country or speak the language?
Not for every process. Proving citizenship held from birth often has no residence or language test. An ancestry-based naturalization process may require one or both.
Can I keep my current citizenship?
Maybe. You need to check the law of both countries. One may allow dual citizenship while the other imposes loss, permission, or reporting rules.
Can ByLineage guarantee the result?
No. ByLineage can help organize the family line, identify possible processes and evidence gaps, and connect you with an independent specialist where appropriate. The relevant authority makes the decision.