Poss. HM George I's 13-Great Grandfather. Poss. HRE Charles VI's 13-Great Grandfather. Poss. U.S. President [WASHINGTON]'s 17-Great Grandfather. HRH Charles's 22-Great Grandfather. Poss. PM Churchill's 21-Great Grandfather. Poss. Lady Diana's 22-Great Grandfather. Louis XVII's 18-Great Grandfather. HM Juan Carlos' 21-Great Grandfather. Poss. Jamie's 24-Great Grandfather.