shane04 wrote:
Matthew Perry's dad is actor John Perry. He has done many tv shows and he also played Matthew's onscreen dad in the movie "Fools Rush In".

Ben Stiller's dad is Jerry Stiller who played Frank Costanza, the father of George Costanza in Seinfield. 
Jerry Stiller also played Arthur on King of Queens. His wife/Ben's mom is Anne Meara. She played Spence's mom KoQ and she had a crush on Arthur. Arthur couldn't stand her - so his real wife was playing a lady he hated onscreen. And she is Steve's mom on Sex in the City.