Great Grandpa Shumway was the Melmacian inventor of extra wide dental floss. (ATAS: "Thank Gordon for Little Girls")
His father was Sherman Shumway, Supreme Commander of the Orbit Guard. (ATAS: "Two for the Brig")
His son was the inventor of the electric cat opener. (ATAS: "Thank Gordon for Little Girls")
He was the paternal grandfather of Bob Shumway, as well as the paternal great grandfather of Gordon, Curtis, and Augie Shumway.