Marty Fitzgerald Walker
Marty Fitzgerald Walker better known as Pappy Walker (June 2nd, 1919 – November 20th, 1997) was the grandfather of Peter Griffin and the father of Thelma Griffin. and the great-grandfather of Meg Griffin Chris Griffin and Stewie Griffin. He was a cartoonist who worked at Disney. He abandoned his family to pursue his career in the 1950's.