Life’s good for deliveryman Doug Heffernan, until his newly widowed father-in-law, Arthur, moves in with him and his wife Carrie. Doug is no longer the king of his domain, and instead of having a big screen television in his recently renovated basement, he now has a crazy old man.
Its Christmas time and Doug's parents are coming over. The only problem is that Doug and Carrie are trying to conceive because of Carrie's "fertile time." After trying to not tell his parents, Doug finally tells them of the situation and leaves the house for one night. That night, Doug can't perform because he is under pressure by his parents and Arthur.