Seldom seen during the show's first season, Princeton student Sondra nevertheless manages to make her presence felt. Sondra is the first of the group to marry and bring a spouse into the Huxtable fold... literally, because she and her husband Elvin actually move back in with Cliff and Clair. This supposedly "temporary" arrangement does tend to complicate Cliff's life, especially when Sondra and Elvin produce the first Huxtable grandchildren, twins Nelson and Winnie.