The Simpsons: Double, Double, Boy in Trouble

Lenny wins the lottery and invites the Simpson family to a party at a nice hotel. Bart meets Simon Woosterfield, who is a member of the richest family in Springfield. Simon and Bart decide to change places, and Bart arrives at the Woosterfield mansion only to find football great Joe Montana hanging out. As Simon adjusts to life over at the Simpson household, Bart begins to notice his new siblings acting strangely. With some words of wisdom from Mr. Burns, Bart realizes his new siblings are plotting to kill him so they can inherit the family fortune. Lisa and Simon must get to Bart before the Woosterfield children do.