Malcolm in the Middle (2000)

S4E3 Family Reunion

In this lively episode, Christopher Lloyd brings to life Walter, Hal's eccentric and irritable wealthy father. The family gathers to celebrate Walter's birthday, but the pretentious female relatives are more focused on antagonizing Lois. Hal, eager to connect with his self-absorbed dad, and Dewey and Reese, who are trying to win some of Grandpa's money, initially overlook the rude behavior. However, when Lois is left in tears after being excluded from a family photo, the rest of the family unites to support her, leading to chaos that transforms the party into complete mayhem.