French Citizenship by Descent for Americans: Parents, Grandparents, the 50-Year Rule

French citizenship by descent is not something you apply for. Under article 18 of the Code civil, a child with at least one French parent on the day of birth is French, wherever the birth took place, so an American with a French mother or father has been French since birth and only has to prove it. A grandparent or great-grandparent counts only through an unbroken chain of French parents, and a family settled outside France for more than 50 years without French papers can be barred from proving it. This guide covers the rule, the generations, the 50-year rule and the way back from it, the certificat de nationalité française (certificate of French nationality, or CNF) that proves it, and the steps up to the passport. This article is for informational purposes only and does not constitute legal advice. Rules change, and your situation may differ: always verify current requirements with the relevant French authorities or a licensed professional.

Who Is French by Descent: The Rule in Article 18

You are French by descent (par filiation) if at least one of your parents was French on the day you were born. Article 18 of the Code civil says it in one line, “Est français l’enfant dont l’un des parents au moins est français,” and service-public adds that it does not matter whether the child was born in France or abroad, or whether the parents were married.

Two conditions sit behind that line. The parent must have been French at your birth: born French, or made French before you were born. And under article 20-1, filiation counts for nationality only if it was established while you were a minor. For a child born in the United States outside marriage to a French father, the French consulates’ birth registration file is explicit: the father’s name on the US birth certificate is not enough, and an acknowledgment of paternity is required.

Does France Have a Citizenship by Ancestry Program?

No. France has no citizenship by ancestry program, no quota and no cap: the official pages on French nationality describe none. Either the chain of French parents reaches you and you are already French, or it does not, and a French ancestor gives you nothing to apply for.

Service-public’s overview of the ways to obtain French nationality lists two routes for a person who is not French: naturalization, which rests on residence in France, and the declaration, open to the spouse, the brother or sister, and the parent or grandparent of a French citizen. A descendant is not on that list: the family declaration runs the other way, for a person aged 65 or more who has a French child or grandchild and has lived in France for 25 years.

Grandparents and Great-Grandparents: How Many Generations Back?

The Code civil sets no number of generations. A French grandparent or great-grandparent makes you French only if every generation in between was French when the next was born: your grandparent when your parent was born, your parent when you were born.

The Justice Ministry’s notice for the CNF form calls this a chaîne de filiation (chain of descent), and service-public’s CNF page asks for the birth certificates of all the ancestors, back to and including the first French one. Each link is judged by the law that applied to that person: the notice’s table goes back to the law of June 26, 1889, for people born from June 30, 1868.

The chain breaks if an ancestor lost French nationality before the next generation was born, which the greffe (the court registry) checks. In an American family, the event to look at is the ancestor’s US naturalization. Today, article 23 says a French adult living abroad who acquires another nationality loses the French one only by express declaration. It was not always so. The Conseil constitutionnel recalls that under the 1945 nationality code a French adult who voluntarily acquired a foreign nationality lost the French one as a rule, and that from 1954 this loss required government authorization for men. In that decision of January 9, 2014, it ruled that women who lost French nationality this way between June 1, 1951 and the entry into force of the law of January 9, 1973 can invoke its ruling, and that their descendants can rely on decisions recognizing that these women stayed French. Whether a naturalization in your family broke the chain depends on its date and on who it was: a question for a lawyer.

The 50-Year Rule: What the Code Civil Actually Says

The “50-year rule” is article 30-3 of the Code civil. If you live or have lived abroad, where the ancestors from whom you hold French nationality remained settled for more than half a century, you are not allowed to prove that you are French by descent when neither you nor the parent who could have passed it on has had the possession d’état de Français, the standing of a person treated as French.

The court must then record the loss of French nationality under article 23-6: the judgment sets the date of the loss and can decide that the nationality was already lost by the ancestors you hold it from and that you were never French. The Justice Ministry’s notice calls this désuétude (loss through disuse): there is no perpetual transmission of French nationality by descent when a family settles abroad for a long time without actively keeping up the tie. It can be raised when you ask for a CNF, and in court. Three conditions have to be met together:

Possession d’état, in the notice’s words, is behaving as a French person and being treated as one by the French authorities: notably a French ID card or passport, a voter card, military papers, or registration on the register of French nationals abroad. So the rule does not count 50 years from your birth and sets no age limit: it looks at how long the family has been settled abroad, and at whether you or your French parent have had French papers.

What You Can Do When the 50-Year Rule Applies

A person stopped by article 30-3, or whose loss was recorded under article 23-6, can claim French nationality by declaration under article 21-14 of the Code civil. The condition is to have kept or acquired manifest ties with France of a cultural, professional, economic or family kind, or to have served in a unit of the French army or fought in the French or allied armies in wartime.

The decree that lists the documents asks for documents proving the ties, a criminal record extract from the countries where you lived over the last ten years, and the judgment or the decision that applied article 30-3 to you. The declaration therefore follows a refusal or a judgment; it does not replace the CNF request. Under articles 26 to 26-5, it is received by the director of greffe services of a tribunal judiciaire or by the consul, and once registered it takes effect on the date it was signed: you are French from that day, not from birth.

The texts name the kinds of ties, not what proves them, which makes this a file to build with a lawyer. Without such ties, what remains is naturalization after five years of residence in France, which begins with the step-by-step move to France from the US.

French by Descent vs Naturalization: What Is the Difference?

Being French by descent means you have held the nationality since birth and only have to prove it. Naturalization makes a foreigner French from the date of a decree, after five years of residence in France, and the administration is free to refuse.

Other guides cover the right-hand column: the B2 language requirement, the civic exam in force since 2026, the reasons naturalization files are refused and the choice between citizenship and the 10-year resident card.

The Certificat de Nationalité Française: Where an American Applies

The CNF is the official document that proves you are French, and only the director of greffe services of a tribunal judiciaire can issue it. Born abroad and living abroad, you mail or hand in your request at the tribunal judiciaire de Paris, service de la nationalité française. The French consulates in the United States state that they have no competence for CNFs: they can neither help you build the file nor forward it.

You need it for a first passport or ID card, and the consulates ask an adult for it before they register a US birth. It is free and has no period of validity. The rules come from the form’s page on service-public and its notice (n° 52373):

• The request is made only on form cerfa n° 16237, never on plain paper.
• The CNF is strictly individual: one request per person, and yours proves nothing for your children or siblings.
• An adult files personally, and a lawyer is optional. A minor may file alone from age 16.
• You declare an email address on the form. The Paris court treats a request without that declaration as inadmissible.
• The address: Tribunal judiciaire de Paris, Service de la nationalité française, Parvis du Tribunal de Paris, 75859 Paris Cedex 17.

The CNF File: Documents, Apostilles and Translations

Every request carries the form, your full birth certificate, an official ID, a recent color ID photo and proof of address. For nationality by descent you add the birth certificate of your French parent and the records that establish each link, back to and including the first French ancestor.

The notice is strict: originals only, translations included, nothing by email, and no extracts of civil-status records. A foreign public record must carry an apostille when it comes from a state that is party to the Hague Convention, as the United States is: each record is apostilled by the Secretary of State of the state that issued it. Every document in a foreign language needs a French translation by a translator on the lists of the French cours d’appel or of the Cour de cassation, or by an expert authorized in another EU or EEA state or in Switzerland.

In France, a full copy of a birth certificate comes from the mairie of the place of birth, free of charge, and descendants are entitled to ask. In the US, you can order and apostille records without flying back.

How Long the CNF Takes, and What Happens After a Refusal

Once your file is complete, the greffe sends a récépissé, and from that date it has 6 months to decide, a period it can extend twice by the same length: 18 months at most. If no decision has arrived by the end, the request is refused.

Before the récépissé comes a simple acknowledgment of receipt, and the greffe can ask for more records: no official page gives a time for that first phase. When the answer is yes, the French consulate summons you and hands you the certificate in person, against your original ID. After a refusal, or silence at the end of the period, the notice describes three options:

• A challenge before the tribunal judiciaire within six months, to obtain the certificate. A lawyer is mandatory.
• An action déclaratoire de nationalité française, which asks the court to rule that you are French. It has no time limit, and a lawyer is mandatory.
• A new CNF request, if you now hold the records that were missing.

After the Certificate: Birth Registration, Passport and ID Card

With the CNF, you can have your US birth certificate transcribed onto the French consular civil-status registers, by mail and free of charge, and apply in person at a French consulate for the passport (96 euros for an adult) and the national ID card (free for a first request). The consulates’ pages do not set an order between the two.

For the transcription, the consulates’ civil-status page sends births in the consular districts of Atlanta, Boston, Chicago, Miami, New York and Washington to the consulate general in Washington, and those of Houston, New Orleans, Los Angeles and San Francisco to Los Angeles. An adult’s file includes the request form, the original long-form birth certificate issued within the last six months with its apostille, a copy of the CNF, your ID and a full copy of your French parent’s birth certificate. Records in English are not translated here, unlike at the Paris court.

For the passport, the consulates’ page, updated on August 10, 2026, requires you to come in person and prove your nationality: a French birth certificate that mentions the delivery of a CNF does it, and so does the original certificate. The ID card is free for a first request. Registration on the register of French nationals abroad is optional and free, and it is one of the documents that make up possession d’état.

Until you hold proof of French nationality, you enter and stay in France as an American: 90 days in any 180-day period without a visa.

Adoption, a Parent Who Became French Later, and Former French Territories

Only full adoption (adoption plénière) by a French parent makes a child French by descent; simple adoption does not change the child’s nationality, and the adopted child becomes French only by a declaration of nationality signed while still a minor and living with the adopter. A parent who became French after your birth made you French only if you were then a minor living with that parent and your name is in the decree or the declaration.

• Adoption. A minor adopted in the plénière form by a French person is French by descent, from birth. An adoption decided abroad counts only if it corresponds to a French adoption plénière.
• A parent naturalized later. If your parent became French when you were already an adult, it has no effect on your nationality, and your own route is naturalization.
• Former French territories. When the French ancestor comes from a territory that became independent (the notice lists Algeria, Senegal, Madagascar and Vietnam among others), the greffe checks that the ancestor was French before independence, then kept French nationality under the text that applied to that state. These files need a lawyer.

Passing It On: Your Children and Your Spouse

If you are French, your children are French under the same article 18, including those born before you held your certificate, since the law treats you as French from birth. Your American spouse does not become French through you, but marriage to a French citizen opens a visa of its own and, after four years, a declaration of nationality.

For a child born in the United States, you declare the birth at the consulate in person within 30 calendar days; after that, you ask for its transcription by mail, with no deadline. Adult children file their own CNF request, and keeping French papers current is what gives the next generation its possession d’état. For your spouse, see the visa for the American spouse of a French citizen, which requires a US marriage transcribed onto the French registers, and the declaration of nationality after four years of marriage.

The US Side: Dual Citizenship and Taxes

Both countries allow dual nationality (service-public confirms it for France), so being recognized as French costs you nothing on the American side: you keep your US passport and still use it to enter and leave the United States, as our guide to dual citizenship between France and the USA explains. Your US tax filing does not change, and France taxes by residence, not by nationality: US taxes when you live in France covers what happens if you move.

Common Mistakes to Avoid

• Treating “born in France” as “French.” What counts is the nationality of each parent on the day the next generation was born.
• Sending the file to the consulate. A person born and living abroad writes to the Paris court.
• Sending photocopies, extracts, scans, or a translation by a translator who is on no French court list.
• Leaving out an ancestor’s US naturalization. A change of nationality in the chain is what the greffe checks, under the law of its date.
• Reading silence as “still pending.” At the end of the legal period, no answer is a refusal.

Practical Checklist

• Write the chain down, back to the first French ancestor: each date and place of birth, and each nationality when the next was born.
• Note every event that may have cost an ancestor French nationality, above all a US naturalization, and the French papers you and your French parent have held.
• Order full copies of the French certificates from the mairies, dated less than three months when you file.
• Order original long-form US certificates, with an apostille from the issuing state and a translation by a translator on a French court list.
• Fill in form cerfa n° 16237 with an email address, one form per person, keep a complete copy, and mail the originals to the Paris court.
• Note the date of the récépissé: 6 months, extendable twice, then six months to challenge a refusal.
• With the CNF, request the transcription of your birth certificate and book the passport appointment.

When to Get Help

A file with a parent born in France and French papers in the family is one you can assemble yourself: a lawyer is optional for the CNF request. A lawyer becomes mandatory when you challenge a refusal or bring a declaratory action, and is the sensible choice when the chain runs through a US naturalization, an independence, an adoption abroad or the 50-year rule. If you want to go through your family’s chain and the order of the steps before you spend on records and translations, a Consulting Call is the place to do it.

FAQ

Am I a French citizen if my parent is French?

Yes, if that parent was French on the day you were born and your filiation to that parent was established while you were a minor. It does not matter that you were born in the United States or that your parents were not married.

Can you get a French passport if your grandparents were born there?

Not on that fact alone. A grandparent born in France matters only if he or she was French when your parent was born, and if your parent was French when you were born. And if the family has been settled abroad for more than 50 years without French papers, article 30-3 can bar the proof.

How do I apply for French citizenship by descent?

You do not apply for the citizenship, you ask for proof of it. Fill in form cerfa n° 16237, attach the original records of each generation with their apostilles and sworn translations, and mail the file to the tribunal judiciaire de Paris.

Can I get a French passport if I was born in France?

Not by birth in France alone. A child born in France is French at birth if a parent is French or if a parent was also born in France. A child of two American parents is not, as our guide to having a baby in France as an American explains.

How much does a certificate of French nationality cost?

Nothing: service-public and the Justice Ministry both state that it is free. Your costs are the records around it: certified copies, apostilles and sworn translations. Afterwards, the transcription and a first ID card are free, and an adult passport costs 96 euros.

Do I have to speak French or live in France to be French by descent?

No. Article 18 sets neither condition, and the official list of CNF documents contains no language certificate and no civic exam. The form and its notice are in French, though, and every foreign-language document has to be translated.

Conclusion

French citizenship by descent comes down to three questions. Was your parent French on the day you were born? Through a grandparent or a great-grandparent, was every generation French when the next was born? And if the family has been settled outside France for more than 50 years, have you or your French parent held French papers? Three yeses make you French from birth, with a free certificate from the Paris court as proof. A no on the third leads to the declaration of article 21-14 and to a lawyer. A no on the first two leaves naturalization.