Poss. HM George I's 11-Great Grandfather. Poss. HRE Charles VI's 13-Great Grandfather. Poss. U.S. President [WASHINGTON]'s 16-Great Grandfather. Poss. PM Churchill's 21-Great Grandfather. Poss. Lady Diana's 20-Great Grandfather. Poss. PM Cameron's 20-Great Grandfather. Poss. Jamie's 23-Great Grandfather.