Homer and Marge sign a legal document which officially name Bart as Mr. Burns ' heir . Marge suggest that Bart should spend some time with Mr. Burns . While initially repelled by Mr. Burns ' coldness , Bart begin to take a liking to him after Burns promise to give Bart whatever he want out of his life . Bart decide to abandon his family because Mr. Burns allow him to do anything he like . Bart 's family become angry and want him back , so they decide to sue Mr. Burns , but due to hiring Lionel Hutz as their lawyer , the court end up deciding that Mr Burns is Bart 's biological father . The Simpsons get a Private Investigator deprogrammer to kidnap Bart , but the deprogrammer wrongly take Hans Moleman instead and brainwash him into thinking he 's a part of the Simpson family .