Hur blir man fransk medborgare?

Det kanske blir svårt eftersom man enligt wiki måste hävda juridiskt att barnet har en fransk förälder INNAN det blir myndigt. Men det finns ju även andra sätt. Bäst är nog att ta kontakt med fransk ambassad så kan de förklara vad som går att göra.
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French citizenship by birth abroad to at least one French citizen[edit]

The child (legitimate or natural) is French if at least one parent is French.

In the case of an adoption, the child has French nationality only under the "full adoption" regime.

Parentage to the parent from whom the French nationality is claimed, must be established while the child is still a minor (under 18).

When the child is born abroad from a French parent, it is essential for the French parent to record the birth of the child in the French civil register. In the event of litigation or to establish definitive proof of French nationality (or request a French passport) French nationality may be established by petitioning for a French nationality certificate from the Tribunal d'Instance (local court) of the person's place of residence, or if residing abroad, via the French Nationality Office in Paris[5] having jurisdiction over French persons residing abroad.

https://en.wikipedia.org/wiki/French_nationality_law

Torde väl vara ganska lätt att googla till sig den typen av info? Lär väl finnas på t.ex. den franska regeringens eller kanske den franska ambassadens hemsida.

Inga problem, det kallas blodsrätt. Prata med ambassaden!

www.vie-publique.fr/fiches/23849-comment-devient-citoyen-francais

Man kan också gå med i främlingslegionen.

legio patria nostra!