sa soeur

his sister / her sister

→ son
phrase Rare #32,112
his sister / her sister “Sa” can mean either “his” or “her”; the possessive agrees with “soeur,” not with the person who possesses her.
FR: Il est venu avec sa soeur.
EN: He came with his sister.

C'est sa soeur, non?

She's his sister, right?

— Volver (2006)

Alors, lui et sa soeur, Franci, sont arrivés.

Then he and his sister, Franci, arrived.

— Carandiru (2003)

Parce que c'était la nuit où Kelly, a descendu son mari et sa soeur.

Because it was the night Kelly shot her husband and sister.

— Chicago (2002)

Peut-être même plus dur que de tuer sa soeur.

Perhaps even harder than killing one's sister.

— Avengers : Infinity War (2018)

C'est sa soeur.

She's his sister.

Pour elle, sa soeur vit toujours.

For her, her sister is still alive.

— Volver (2006)

Sa soeur.

His sister.

Je suis sa soeur.

I am his sister.

Pour se protéger elle a tué sa soeur mannequin et pris sa place.

To protect herself, she killed her model sister and took her place.

— Perfect Blue (1998)