When Claire was born, LifeSimmer was disappointed to have another daughter; she already had boys' names picked out and came up with Claire on a whim. This is why she, unlike her older sisters, is not named after a famous actress.
Claire was generally neglected until the family visited Three Lakes. While there, she became the log rolling champion and Lifesimmer slowly started to like her, and even felt bad for her when she peed herself.
She makes an appearance in The Sims 2 University LP.