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French citizenship by descent and the 50-year rule
Say which ancestor was French, when the family started being born in the US and whether anyone kept French papers: the tool applies the 50-year rule.
Does the 50-year rule block your French line?
Family abroad for 76 years
Not eligible
| Route | Blocked by the 50-year rule |
| Threshold of art. 30-3 | 50 years abroad without French papers |
| Fee | Free |
| Legal time limit | 6 months from the receipt, extendable twice by 6 months (18 months at most) |
The family has lived abroad since at least 1950, more than 50 years, and no French papers were kept: art. 30-3 bars proof by descent.
French citizenship by descent rests on one sentence of the Civil Code: a child is French if at least one parent is French (article 18). Mother or father, married or not, the parent must be French on the day of the birth. In theory that chain has no end. In practice, article 30-3 closes it for most American families. When the French line has lived abroad for more than 50 years, and neither you nor your French parent ever behaved as French and was treated as French by French authorities, for example by holding a French passport or registering at a consulate, French nationality by descent can no longer be proven. Where the chain is intact, proof is a certificate of French nationality from the Paris judicial court, free of charge, with a legal limit of 6 months from the receipt, extendable twice by 6 months (18 months at most).
What will the file cost?
US side of the file
$251
| 5 certified records (2 births, 2 marriages, 1 deaths) | $126 |
| Apostilles (5 records) | $100 |
| Naturalization proof | $25 |
| Translations (6 documents) | $0 |
| France fee | free |
Records from the old country are not counted: they are ordered there.
Rules read and verdicts built by Radif Partners · Editorial policy · How verdicts are built
The basic rule: a French parent on the day you were born
France has no grandparent route and no ancestry visa. Nationality passes from parent to child at birth, and only that way. A grandchild is French only if the parent in between was French when the grandchild was born. So the question for an American family is whether each person in the line was French at the next birth, and whether that can still be proven today.
The parent can be the mother or the father, married or not. Filiation must be legally established while the child is a minor. The place of birth does not matter: a child born in Chicago to a French father is as French as one born in Lyon. The French consular network in the United States adds that the French parent must stay French during the child's minority.
The 50-year rule in detail
Article 30-3 is the rule that ends most French claims made by Americans. It applies when three facts come together.
| Condition | What it means | Example |
|---|---|---|
| The person lives or lived abroad | You were born or settled outside France | Born in the US |
| The French ancestors in the line have been settled abroad for more than 50 years | Counted back from your application | Grandfather emigrated in the 1950s |
| Neither you nor your French parent had possession d'état | No passport, ID card, consular registration or similar | Parent never held French papers |
When all three hold, the court will not accept proof of nationality by descent, even if the documents are perfect. The rule does not say you lost French nationality; it says you can no longer prove it by filiation. The effect is the same. A family that kept renewing French passports, generation after generation, escapes the rule. A family that stopped being French in the eyes of French authorities after the emigrant does not.
The rule makes the timeline essential. A French-born parent who moved to the United States and held a French passport makes a claim easy. A French-born grandparent works only if the parent in between held French papers or the line has been abroad for less than 50 years. A great-grandparent who emigrated before the Second World War almost never works without French documents in the family.
Three typical American cases
A woman born in Boston in 1985 to a father born in Marseille, who kept his French passport: she is French by filiation, the 50-year rule cannot apply, and the certificate is a matter of paperwork. A man born in 1980 whose grandmother left Brittany in 1946, and whose mother never held French papers: the family has been abroad for more than 50 years with no possession d'état, so article 30-3 blocks him unless ties to France open article 21-14. A student born in 2004 whose grandfather emigrated in 1990: the line has been abroad for less than 50 years, so it can still be proven if each link was French at the next birth. The family tree checker runs the same test on your own dates.
Older births and the law at each date
The court applies the law in force at each birth in the line. France's nationality rules changed several times before 1973, and older texts dealt differently with mothers, with women who married foreigners and with men who naturalized abroad. Those historic rules are not covered in detail here; if your line includes births before 1973 through a French mother, or an ancestor who took US citizenship early in the twentieth century, expect the court to look closely at those links.
The certificate of French nationality
Proof of French nationality by descent is a certificat de nationalité française. For people born and living abroad, the nationality service of the Paris judicial court decides (service-public guide). You fill in form cerfa 16237 with a family tree, attach the originals of all records and proofs, and mail the file to Paris. The clerk may ask for more documents, then issues a receipt once the file is complete. From that receipt the legal limit is 6 months from the receipt, extendable twice by 6 months (18 months at most). Silence at the end of the period counts as a refusal, which you can challenge before the Paris court within six months. No average time is published. The Foreign Ministry FAQ still uses the court's former name for the same office.
The certificate costs nothing: the procedure is free. With it you can have your birth transcribed in the French civil registry and apply for a passport at a French consulate.
Documents, apostilles and translations
The court wants full copies of the birth records of you and of each ancestor in the line, plus the marriage and filiation records that link them. It asks for originals, not photocopies, except for identity documents and records that exist in one copy only. Every document in English must be translated into French by a translator registered as a sworn expert with a French court of appeal, and the original translation goes in the file. US public records generally need an apostille from the issuing state. Where the 50-year rule could apply, add every French paper the family kept: passports, identity cards, consular cards, military records. The US documents guide explains how to order certified copies and apostilles, and the cost calculator includes translations.
Dual citizenship
France does not ask you to give up US citizenship, and a French national who takes another nationality stays French unless they ask to lose it. The United States has no objection to a second citizenship either; the dual citizenship page covers the US side and the tax page what changes for your returns. To compare France with countries that have no time bar, see the country table and the second passport guide.