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Three days before Christmas, the Engel family—parents Tom and Sarah, daughter Beth, son Max, and Tom's mother, whom the family calls Omi—prepares for the holidays. Despite his family's dysfunction, Max still believes in Santa Claus and writes him a letter with Omi's encouragement. Sarah's sister, Linda, brings her family and bulldog Rosie to come visit and stay for the holiday, along with their cantankerous Aunt Dorothy. This fuels tension, as Tom hates Linda's husband Howard, and Linda's children Stevie, Jordan and Howie Jr., don't get along with Max or Beth.