What are Toby and Ken's mother's names in The Egypt Game?

Toby and Ken are sixth-grade boys whom April and Melanie eventually allow to join the Egypt game. Readers don't find out much about the boys' mothers in the book. Toby's father, Mr. Alvillar, had been a graduate student and now made sculptures from used materials. He is the one who comes up with Toby's costume idea as the "box man," or the "New American," and after Halloween he puts Toby on restrictions for having squashed the costume. Ken's father, Mr. Kamata, is a real estate agent. He sells quite a few properties in the area, so he is able to purchase Halloween costume items, such as a mask and monster hands and feet. Mr. Kamata is one of the fathers who chaperones the group of children on Halloween. If you needed to have names for the boys' mothers, assuming they have mothers, you could just refer to them as Mrs. Alvillar (Toby's mother) and Mrs. Kamata (Ken's mother).