Brad and Kate have been together three years, in love, having fun, doing all sorts of things together with no intention of marriage or children. Christmas morning, they're on their way to Fiji, having told their two sets of divorced parents that they're off to do charity work. Through a fluke, they have no choice but to visit each of their four idiosyncratic parents. As the day progresses, Brad and Kate remember growing up, each learns more about the other, and Kate realizes that her life may...

After their wedding, newspaper writers John and Jennifer Grogan move to Florida. In an attempt to stall Jennifer's "biological clock", John gives her a puppy. While the puppy Marley grows into a 100 pound dog, he loses none of his puppy energy or rambunctiousness. Meanwhile, Marley gains no self-discipline. Marley's antics give John rich material for his newspaper column. As the Grogans mature and have children of their own, Marley continues to test everyone's patience by acting like the world's...