Kids trying to get parents back together big log cabin

Two identical twin sisters, separated at birth by their parents' divorce, are reunited years later at a summer camp, where they scheme to bring their parents back together. The girls, one of whom has been living with their mother and the other with their father, switch places after camp and go to work on their plan, the first objective being to scare off a gold-digger pursuing their father.

Hallie Parker and Annie James are identical twins separated at a young age because of their parents' divorce. Unknowingly to their parents, the girls are sent to the same summer camp where they meet, discover the truth about themselves, and then plot with each other to switch places.

Admiral Frank Beardsley returns to New London to run the Coast Guard Academy, his last stop before a probable promotion to head the Guard. A widower with eight children, he runs a loving but tight ship, with charts and salutes. The kids long for a permanent home. Helen North is a free spirit, a designer whose ten children live in loving chaos, with occasional group hugs. Helen and Frank, high school sweethearts, reconnect at a reunion, and it's love at first re-sighting. They marry on the spot. Then the problems start as two sets of kids, the free spirits and the disciplined preppies, must live together. The warring factions agree to work together to end the marriage.

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.

They used to spend every summer here, but now the daughters have grown up, the parents are divorced and the wooden cabin at the lake has to be cleared out. Those four, once a family, come together again for a whole weekend - and the feelings and memories of the past are closer than they thought.