The original family only consisted of four children, two boys and two girls. Jaleel White, who played Family Matter’s future hit character Steve Urkel, auditioned to be Rudy and had auditioned so well that his agent told his parents that they should start looking for apartments in New York, where The Cosby Show was filmed. Girls were allowed to audition for the role of Rudy, and Keisha Knight Pulliam became the adorable Rudy Huxtable.

Source: BuzzFeed