Poss. HM George I's 12-Great Grandfather. Poss. HRE Charles VI's 13-Great Grandfather. Poss. U.S. President [WASHINGTON]'s 17-Great Grandfather. Poss. PM Churchill's 20-Great Grandfather. Poss. Lady Diana's 21-Great Grandfather. Poss. PM Cameron's 21-Great Grandfather. Poss. `Red Baron' Richthofen's 16-Great Grandfather. Poss. Jamie's 24-Great Grandfather.