Sondra Tibideaux

&nbsp Sondra Tibideaux (nee Huxtable) (Sabrina LeBeauf), the eldest daughter of Cliff and Clair, did not appear on screen until mid-way through Season 1. She did not exist in the pilot episode (Clair: "Why do we have four children?" Cliff: "Because we did not want five.") In her first appearance, she is a sophomore in college, 20 years old putting her birth year in 1964. She earned a degree from Princeton University. She married her boyfriend, Elvin Tibideaux, in Season Four, and later gave birth to twins—a boy and a girl—named after Nelson and Winnie Mandela. More serious, earnest and responsible than the other children, Sondra fits many of the characteristics of an eldest child. Though she had her moments of bizarre thinking (e.g. dropping out of law school to open up a wilderness store), she'd usually snap out of them relatively quickly. Because of her intelligence level and overachieving nature, she's looked upon by her parents proudly, but also is held to a higher standard than the rest of the children.

Sondra was created when Bill Cosby wanted the show to express the accomplishment of successfully raising a child (e.g. a college graduate).