his cousin / her cousin
Il s'entend bien avec sa cousine.
He gets along well with his cousin.
Tom a embrassé sa cousine.
Tom kissed his cousin.
Si elle s'approche d'abord de sa cousine, elle sera ma femme.
If she approaches her cousin first, she will be my wife.
— Guerre et Paix (1968)
Avoir des enfants est toujours risqué, qu'on baise ou non avec sa cousine.
Having children is always risky, whether you have sex with your cousin or not.
— Le Loup de Wall Street (2013)
His cousin is my wife.
Sa cousine étudie en Allemagne.
His cousin is studying in Germany.
Tom restera chez sa cousine pour Noël.
Tom will be staying with his cousin for Christmas.
Sa cousine, dont j'oublie le nom, était infirmière.
His cousin, whose name I forget, was a nurse.