Poss. HM George I's 12-Great Grandfather. Poss. HRE Charles VI's 13-Great Grandfather. Poss. U.S. President [WASHINGTON]'s 19-Great Grandfather. Poss. PM Churchill's 20-Great Grandfather. Poss. Lady Diana's 21-Great Grandfather. Poss. PM Cameron's 22-Great Grandfather. Poss. Jamie's 26-Great Grandfather.