
...but probably
because her SISTER shot somebody.
The Big Bang Theory Season 1, Episode 2

- Did you...? You slept with my SISTER?
- Yeah.
The Big Bang Theory Season 4, Episode 6

that was this guy's SISTER.
The Big Bang Theory Season 5, Episode 11

How worried your SISTER is about her.
Game of Thrones Season 4, Episode 7

ever since your royal SISTER
commanded us to do so.
Game of Thrones Season 2, Episode 5