Sister-in-law

After seeing Kristina reference a "sister-in-law" on Facebook, I became confused, since I knew that she was not married. (She is a law student.)

me: i'm looking at your pictures
and i have to say
you have no sister in law yet

Kristina: ?
sister in law?
like black friend?

me: wait
how is
your black friend
your sister in law

Kristina: like.. "sista"
....

me: -_-


Later, after accusing her of trying to make up a phrase that was already a phrase, I realized that she actually did have a sister-in-law; her brother is married.