He may be Derek Zoolander to some, or Greg Focker to others, but to his kids, Ben Stiller is always dad, first and foremost.

THEN: Ben Stiller's father, Jerry Stiller, is a comedic actor who made an appearance as Zoolander's agent. He finds himself mixed up in the assassination plot but chooses to come clean at the end.

"I'm sad to say that my father passed away from natural causes ... Stiller appeared with son Ben in several film comedies, among them Zoolander, Zoolander 2 and The Heartbreak Kid.