Facing another Christmas alone, Drew Latham (Affleck) decides to go back to his idyllic childhood home to spend the holidays with family.
There is, however, one problem: the people living there now are not Drew’s family. Nevertheless, Drew has his mind set on an old-fashioned family Christmas, and the fact that the "family" in question, the Valcos, are complete strangers, isn’t about to put a crimp in his plans. Offering them a small fortune, Drew bribes his newfound "parents" (Gandolfini and O’Hara) to let him spend Christmas in their home, pretending to be part of the family.
Just when the Valcos begin to question if any amount of money is worth being dragged all over town on such traditional family holiday excursions as Christmas shopping and the requisite choosing of the Christmas tree, their eldest daughter Alicia (Applegate) comes home for the holidays, with no intention of adopting a new "brother."