An unnamed girl is the sister of Charles. She is around his age, meaning that Charles would often play with her dollhouse when they were children.
Throughout the Series[]
In the Season One episode, The Slump, Charles' sister is shown in a flashback Charles had about the same dollhouse Terry was building. In the Season Two episode, Chocolate Milk, his sister was supposed to be Charles' date for his ex-wife Eleanor Horstweil's engagement party. She had to cancel at the last minute, so Charles asked Rosa Diaz to go instead.