Game of Thrones, depend on

Game of Thrones, Series 01, Episode 08, The pointy end


Sansa Stark (talking about her father): What will happen to him?
Cersei Lannister: That depends.
Sansa Stark:  On what?
Cersei Lannister: On your brother... and on you. 

depend on sb or sthing: It is directly affected or decided by that thing or person