Parentage, adoption, and children in French nationality cases
Review timely legal filiation, historical nonmarital rules, full and simple adoption, kafala, PMA, surrogacy, and effects for children.
Does a biological connection by itself transmit nationality?
No. French nationality through a parent depends on legal filiation and timing, not genetics alone. Start with the act or judgment that made each parent legally effective.
Article 20-1 says filiation affects nationality only if established during minority.
What changes in an older nonmarital case?
Current law does not distinguish parents based on marriage when filiation is legally established. Historical law did. Pre-1973 sex, marriage, legitimacy, acknowledgment, and priority rules must be reviewed under the version then in force.
Do not automatically use age 18 for an old acknowledgment. Civil majority changed from 21 to 18 effective 7 July 1974. Transitional and nationality rules still matter. A later judgment may declare an earlier filiation or create one only then. That distinction needs legal review.
How do full and simple adoption differ?
A full adoption, adoption plénière, can produce nationality effects as filiation when the legal requirements and timing are met. The official CNF checklist asks whether the adopter was French before the full-adoption petition.
A simple adoption, adoption simple, does not itself attribute nationality. A qualifying minor may use a separate declaration under Article 21-12. An adult normally needs review of a different acquisition route.
Foreign orders require characterization and recognition. Articles 370-3 and 370-5 address applicable-law, consent, and whether the foreign adoption produces full or simple effects in France. Obtain the full final order, consent records, finality certificate, and original and replacement birth acts.
What is kafala?
Kafala is protection or guardianship, not adoption or filiation. It does not become ordinary descent. A child may fit a separate Article 21-12 care-and-raising route depending on the exact facts. Treat every kafala case as manual.
What about PMA and surrogacy?
PMA, or assisted reproduction, needs manual parentage review. Collect the conception method and every civil, notarial, and judicial act. Identify the law and date that made each parent legally effective.
Foreign surrogacy, or GPA, also needs manual review. A foreign birth act, judgment, transcription, genetic link, consent, and public-policy issue may affect which filiation France recognizes. Never automate the nationality outcome.
What happens to children?
A person confirmed as French from birth may have transmitted to a child born while that person was French if the child's filiation was timely. A person who acquires later by declaration or decree generally transmits automatically to children born after acquisition.
An existing unmarried minor may sometimes share collective effect under Article 22-1 when the residence and instrument conditions are met. For a declaration or decree from 25 July 1993 onward, the child generally must be named in the instrument. Each child needs an individual review.
What should you find next?
Find the first act that legally established parentage, its date, the child's age under the applicable law, and any later correction or judgment. Then connect those facts to the family chain, CNF evidence, and records plan.
A French court or competent authority decides status or acquisition. ByLineage is private and may match a case with an independent specialist.
Sources checked: 27 August 2026. Historical and nonstandard parentage outcomes remain manual.