Phoebe's grandfather

Phoebe's grandfather
Gender	Male
Relatives	Phoebe's grandmother (wife) Mr. Terese (son or son-in-law) Mrs. Terese (daughter or daughter-in-law) Phoebe Terese (granddaughter)
First Appearance	The Magic School Bus and the Electric Field Trip

Phoebe's grandfather makes appearances in The Magic School Bus And The Electric Field Trip. It's implied that he and Phoebe's grandmother are Phoebe's guardians in the books.