my sister-in-law
Ma belle-sœur m'a prêté sa voiture.
My sister-in-law lent me her car.
La femme de mon frère est ma belle-sœur.
My brother’s wife is my sister-in-law.
On va chez ma belle-sœur ce soir.
We're going to my sister-in-law's house tonight.
Ma belle-sœur dit qu'à Singapour, la situation empire.
My sister-in-law says that the situation is getting worse in Singapore.
— Lust, Caution (2007)
I love my sister-in-law.
My sister-in-law is a doctor.