petite sœur

listen to the pronunciation of petite sœur
Fransızca - İngilizce
little sister

How's your little sister? - Comment va ta petite sœur ?

Oh my little sister, why won't you say anything to me? - Oh, petite sœur, pourquoi ne me dis-tu rien ?

A sibling's younger sister (used especially by children or by parents in speaking to their children)
a younger sister