Orville J. Simpson, or Great-Grandpa Simpson is one of the sons of Old Tut and Happy (née Dinsdale) Simpson (the other being Boris Simpson), the father of Abe Simpson and the paternal grandfather of Homer Simpson. Orville married Yuma Hickman and became the parents of at least twelve children, which include Hubert, Tyrone, Cyrus, Bill, Chet, Hortense and Abraham Simpson. He is also the great-grandfather of Bart, Stanley, Lisa, Jessica, Homer Jr. and Maggie Simpson. In Mathlete's Feat it's mentioned that he raised Abraham and his eleven dead siblings on crick water