Home for the Holidays: You don’t know the first thing about me

A conversation between two sisters from the movie Home for the Holidays:

Claudia: You don’t know the first thing about me.

Joanne: Likewise, I’m sure. If I just met you on the street... if you gave me your phone number... I’d throw it away.

Claudia: Well, we don’t have to like each other, Jo. We’re family.