An American girl, Daphne, heads to Europe in search of the father she's never met. But instead of finding a British version of her bohemian mother, she learns the love of her mom's life is an uptight politician. The only problem now is that her long-lost dad is engaged to a fiercely territorial social climber with a daughter who makes Daphne's life miserable.
Climbing aboard their mammoth recreational vehicle for a cross-country road trip to the Colorado Rockies, the Munro family – led by dysfunctional patriarch, Bob – prepares for the adventure of a lifetime. But spending two weeks together in one seriously small space has a way of cramping their style.
The boy who wasn't supposed to grow up—Peter Pan—does just that, becoming a soulless corporate lawyer whose workaholism could cost him his wife and kids. During his trip to see Granny Wendy in London, the vengeful Capt. Hook kidnaps Peter's kids and forces Peter to return to Neverland.
Samantha MacKenzie, the daughter of the president of the United States, arrives at college with a group of Secret Service agents. Samantha, however, resents their presence and decides she wants to attend school just like a normal student. Her father agrees to recall the agents but secretly assigns James, an undercover agent, to pose as a student. They fall in love, but their romance is jeopardized when Samantha learns James' true identity.
Just when George Banks has recovered from his daughter's wedding, he receives the news that she's pregnant ... and that George's wife is expecting too. He was planning on selling their home, but that's a plan that—like George—will have to change with the arrival of both a grandchild and a kid of his own.
Sylvia's work increasingly takes her away from the three men who help bring up Mary, her daughter. When she decides to move to England and take Mary with her, the three men are heartbroken at losing the two most important females in their lives.
Bill Dancer and his young companion Curly Sue are the classic homeless folks with hearts of gold. Their scams are aimed not at turning a profit, but at getting enough to eat. When they scam the rich and beautiful Grey Ellison into believing she backed her Mercedes into Bill, they're only hoping for a free meal. But Grey is touched, and over the objections of her snotty fiancé.
Steve Martin and Bonnie Hunt return as heads of the Baker family who, while on vacation, find themselves in competition with a rival family of eight children, headed by Eugene Levy,
Howard Langston, a salesman for a mattress company, is constantly kept busy at his job, disappointing his son. After he misses his son's karate exposition, Howard vows to make it up to him by buying an action figure of his son's favorite television hero for Christmas. Unfortunately for Howard, it is Christmas Eve, and every store is sold out of Turbo Man. Now, Howard must travel all over town and compete with everybody else to find a Turbo Man action figure.
The Baker brood moves to Chicago after patriarch Tom gets a job coaching football at Northwestern University, forcing his writer wife, Mary, and the couple's 12 children to make a major adjustment. The transition works well until work demands pull the parents away from home, leaving the kids bored -- and increasingly mischievous.