You will watch The Simpsons Episode 215 Oh Brother, Where Art Thou? online for free episodes with high quality. Online episode guide, The Simpsons Episode 215 Oh Brother, Where Art Thou? Oh Brother, Where Art Thou? Grampa confesses that Homer has a half-brother, who immediately tries to track him down. Homer eventually discovers that his half brother is Herbert Powell, the head of a car manufacturer in Detroit. Herb immediately starts to bond with Bart and Lisa and he invites Homer to design his own car. Homer’s car design is a disaster, causing Herb to become bankrupt.