Mr. Faust

Mr. and Mrs. Faust are the parents of Ruby Kane, and the grandparents of Carter and Sadie Kane and members of the Faust family. They blame Julius Kane, their former son-in-law, for Ruby's death. After her death, they gain custody of Sadie; it is implied that they do not wish for custody of Carter due to his race and greatly favor Sadie for her resemblance to her mother. They reside in London, England.

The Red Pyramid
The Fausts live in England with their granddaughter. After the explosion at the British Museum, the Fausts and the Kane family are visited by Amos Kane and Mrs. Faust reluctantly lets Sadie go with Amos and Carter, as she knows it is Sadie's destiny. They keep a shrine to their deceased daughter, Ruby Kane. Mrs. Faust and her husband appear to know of magicians, but do not practice magic themselves.

Mrs. Faust makes bad biscuits/cookies; she is quite colorless, a stark contrast to her lively daughter. Mr. Faust is an ex-rugby player with beefy arms and a belly too big for his shirt; he is described as scary-looking and can usually scare people.

The Throne of Fire
When Sadie goes to visit them and her friends in London, she finds that Mr. and Mrs. Faust are unintentionally hosting Babi and Nekhbet, the baboon and vulture gods, who proceed to hunt Sadie and her friends across London.