Father’s Day (1997)

Smart aleck lawyer, Jack Lawrence is one day visited by an ex-girlfriend who tells him her child is his. Enter Dale Putley. A depressed goofball who is also a writer, Dale meets with the same ex-girlfriend who also tells him her child is his. One day Jack and Dale meet and discover they've been told the same story—and there is now a question of who the real father is. They learn their son is following a rock band around Sacramento, so Jack and Dale must use teamwork to find him—and then find out which one of them is the real father.