French Civil Code

A civil registrar who fails to require proof of the notification prescribed by Article 154 shall be sentenced to the fine provided for in the preceding article.

If there are no fathers, mothers, grandfathers or grandmothers, or if they are all unable to express their will, minors aged eighteen may not contract marriage without the consent of the family council.

If the current residence of those of the ascendants of the minor of eighteen years of age whose death has not been established is unknown and if these ascendants have not given any news of them for one year, the minor will make a sworn statement to this effect before the guardianship judge of his residence, assisted by his clerk, in his chambers, and the guardianship judge will take note…

In the direct line, marriage is prohibited between all ascendants and descendants and relatives in the same line.

In collateral lines, marriage is prohibited, between brother and sister, between brothers and between sisters.

Marriage is prohibited between the uncle and the niece or nephew, and between the aunt and the nephew or niece.

However, the President of the Republic may, for serious reasons, lift the prohibitions laid down: 1° By Article 161 to marriages between relatives in the direct line where the person who created the alliance is deceased; 2° (Repealed); 3° By Article 163.