Rachel Cooke is Isabelle’s much bigger sister. They have an unresolved sibling rivalry. She also has a cooking show on Dingstreet Public Access which never goes according to plan. She is also the mother of Isabelle’s wild nephews, Fib and Whopper. When she’s around her own children and on public TV, she keeps up this “so sweet she’ll give you cavities” personality. Around Isabelle, however, she is full of disgust and hatred.