Plot summary
Francis and Piama visit just as the family goes to Hal's family reunion for his father's birthday, and Hal's family makes Lois miserable because she is from a lower-class family. Hal, Piama and the boys are furious for this and plot revenge on the family. Hal clashes with his father, Walter ( Christopher Lloyd ), and forces a confession from him by tickling him. The boys drive a golf cart over the celebration with the help of their younger cousins, destroying the party, and incurring the wrath of the adults. Even though Hal and Lois pretend to be angry at the boys, they are both proud of them for standing up to the family. Lois also finally starts treating Piama kindly, not wanting to turn out like her own in-laws.
Credits
Adapted from Wikipedia contributors, Malcolm in the Middle season 4. HTML formatting and reference markers removed.