Bitzi's father

Bitzi's father is the father of Bitzi and Stu, deceased husband of Buster's grandmother, son of Bitzi's grandfather, and grandfather of Buster. He is mentioned in the episode Background Blues when Bitzi tells Buster that he worked as a Tollbooth operator. Buster also brings his grandfathers lunch box in for the class project and finds an old sandwich from 1955 in it.