Poss. HM George I's 11-Great Grandfather. Poss. HRE Charles VI's 12-Great Grandfather. Poss. U.S. President [WASHINGTON]'s 18-Great Grandfather. Poss. PM Churchill's 19-Great Grandfather. Poss. Lady Diana's 20-Great Grandfather. Poss. PM Cameron's 21-Great Grandfather. Poss. `Red Baron' Richthofen's 16-Great Grandfather. Poss. Jamie's 25-Great Grandfather.