Vince Vaughn and Reese Witherspoon are the starring, happily unmarried couple who find
themseleves stuck at home for Christmas in San Francisco after a fog ruins plans for their
exotic getaway. Four local Christmas celebrations later with parents, step-parents,
siblings and assorted nieces and nephews, the two are forced to re-examine their ideals and
what may or may not be so crazy about their families, and their own future together.