आपकी बहन

your sister

→ आप
phrase Rare #10,221
your sister आपकी is the respectful or plural form of “your” used with feminine nouns. बहन means “sister.”
HI: क्या आपकी बहन घर पर हैं?
EN: Is your sister at home?

उन्होंने रघुबीर सिंह को आपकी बहन के साथ देख लिया था।

They had seen Raghubir Singh with your sister.

— Raat Akeli Hai (2020)

आपकी बहन सबसे आसान परिवार का सदस्य है।

Your sister is the easiest member of the family.

— Incendies (2010)