because her SISTER shot somebody.
The Big Bang Theory Season 1, Episode 2
- Did you...? You slept with my SISTER?
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