This is how you sign Sister in American Sign Language.

How to sign

To sign "Sister" in American Sign Language (ASL), extend the index fingers of both hands. Using your dominant hand, start with the index finger near the side of your mouth, and gently tap it down onto the top of your non-dominant hand.

To sign "Sister" in American Sign Language (ASL), extend the index fingers of both hands. Begin with the index finger of your dominant hand near the side of your mouth, then gently tap it onto the top of your non-dominant hand's index finger.