*Kirk Douglas & Michael Douglas in "It Runs in the Family" & "Cast a Giant Shadow"
*Lloyd & Jeff Bridges in "Tucker: A Man and His Dream" (not sure if he ever acted with other son Beau)
*Rance Howard with both sons Ron & Clint Howard in nearly every movie Ron Howard has directed such as "A Beautiful Mind", "Far and Away", "How the Grinch Stole Christmas" (Jim Carrey version), "Apollo 13", "Splash", etc etc cuz it's a real family thing!
*Jack and Chris Lemmon in "Dad", "Airport 77" and "That's Life"
*Tom Hanks & Colin Hanks in "Band of Brothers" and "That Thing You Do"
I'm sure there are more.
A great source to check is the Internet Movie Database (
www.imdb.com ) and enter an actor's name in the search then once you're on his page, scroll to the bottom and you can enter another actor's name to search and see if they've been credited together.