Religion: not determined yet
Name: Jack Hewitt
Publisher(s): McClintock High School
First Appearance: Writer's Block (2014)
Number of Appearances: 1
Note: grandfather of Hewitt (rival/associate of Milo & Robert)
When F. Jackson Hewitt (rival and former college classmate of Robert and Milo) pointedly asked to be referred to as "F. Jackson Hewitt the Fourth," Milo named F. Jackson's father and grandfather and pointed out that there really is no "F. Jackson Hewitt Jr." or "F. Jackson Hewitt III."
Annoyed by F. Jackson, who came by to gloat over his success as a playwright, Robert asked bluntly: "What do you want, Hewitt?"
F. Jackson said: "Ah, that is F. Jackson Hewitt the Fourth, to you."
Milo said: "Hewitt, you added that number yourself. Your father's name was John. His father's name was Jack."
F. Jackson was unperturbed by Milo's statement. He replied: "Well, at least I am employed."