Oliver's father

Grandpa Frensky is the father of Oliver Frensky. He appears in the episode "Background Blues" helping Francine learn about the Frenskys. He once owned a restaurant called Hamburger Castle. He is seen again in "Francine's Pilfered Paper."

He also appears in Arthur's Perfect Christmas with the rest of the Frensky family. In this appearance, he is recolored to have brown hair.