He is 'seeking revenge for' his father's murder. [=he wants to harm the person who killed his father]
He swore to 'take (his) revenge on' his enemies. [=to harm his enemies]
The bombing was 'in revenge for' the assassination of their leader.
(..) Remember how everybody used to make fun of us in high school? I remember how they made fun of you. Anyway, I have been getting my revenge. I've been getting engaged to all these chicks who broke up with me in high school... 'cause of my acne, and then I dump 'em right before the wedding. Damn. (..)2009 TvShow: It's Always Sunny in Philadelphia Title: The Waitress Is Getting Married Season: 5 Episode 5