Submitted by Petri Dish Kid
Tom Baker (Steve Martin) takes his family along to a final family vacation to Lake Winnetka because a pregnant Nora (Piper Perabo) and her husband Ned (Jonathan Bennett) are moving away since Ned has gotten a job as the VP of an advertising firm while Lorraine (Hilary Duff) is moving to New York to work for Allure Magazine.
They move into a old run down lake house opposite a brand spanking new awesome lakehouse owned by Jimmy Murtaugh (Eugene Levy), Tom’s old rival who’s just married his 3rd (I think) wife, Sarina (Carmen Electra) and he’s got 8 kids. The kids from both families get along it’s just the fathers that bicker.
Elliott Murtaugh goes on a date with Sarah Baker but it’s ruined by Tom and Jimmy spying on them. Charlie Baker (Tom Welling) and Anne Murtaugh (Jaime King) both relate to each other being unable to do what they really want to do by their controlling fathers.
The Bakers and Murtaughs face off for a cup thing and halfway through the final canoe challenge Nora goes into labour and Anne jumps ship to help out followed by the rest of the family. Tom and Jimmy make up at the hospital and Nora names her new son Tom and makes Lorraine the godmother.