Sheldon Skinner

Sheldon Skinner is the father of Seymour Skinner and husband to Agnes Skinner. During World War II, he fought in Grampa's World War II company, the Flying Hellfish, as their Radio Operator. He is also constantly the butt of several jokes by his comrades, with one particular joke involving a note saying "shoot me" being placed on his backside. He remarks that he "didn't join the unit to make friends" grudgingly after realizing the prank. He desired three turkey meals every day after deciding to make the tontine on the Hellfish Bonanza.

He died in a parade float accident in 1979, along with Arnie Gumble, Iggy Wiggum, Etch Westgrin and Griff McDonald, who are all members of Abe Simpson's Flying Hellfish.

Nelson said they egged his grave once.

Despite not being Seymour Skinner's birth father, Sheldon resembles him a lot both physically and mentally.