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.
Doug's kingdom comes under attack when his recently widowed father-in-law, Arthur, moves in rather than go to a retirement home, turning Doug's TV room into Arthur's bedroom.
After seeing photos of Carrie's stout mother, Doug worries that Carrie will gain weight as well, and tricks her into starting a diet.
Doug is afraid he'll lose Carrie when her boss drives her home in his Jaguar and gives her tickets to see a famous cellist.
When Doug takes Carrie's dad out for the night, Carrie shows her appreciation in a very amorous way, which leads Doug to spend more time with Arthur.
