Lois' parents Victor (Robert Loggia) and Ida (Cloris Leachman) come for a visit and don't seem to approve of anyone in the family except Reese.
Lois' parents come to visit. Her mother, Ida Welker and father, Victor Welker are really cruel and horrible people who are very annoying to everyone in the family, with the exception of Reese, whom they believe the be the only one powerful enough to head toward success.
Hal buys a new refrigerator thinking Victor is going to reimburse him for it, but Victor changes his mind.
Victor also gives Reese a case of his old weapons, but Reese pulls the pin and breaks the handle off a live grenade, so Malcolm throws it in the new fridge to keep it from destroying the house, blowing up the fridge in the process. Resulting in Hal forcing Victor to reimburse in the refrigerator and the new one or else go to prison for destruction of property, Kid Endangerment and Giving Reese an explosive handheld weapon without a license and almost bombing the Wilkersons house.
Meanwhile, Francis is sick from a bad sushi while he and the cadets are in New Orleans for Mardi Gras.