HM George I's 19-Great Grandfather. Poss. HRE Ferdinand I's 14-Great Grandfather. Poss. HRE Charles VI's 18-Great Grandfather. U.S. President [WASHINGTON]'s 21-Great Grandfather. PM Churchill's 25-Great Grandfather. Lady Diana's 26-Great Grandfather. Poss. Agnes Harris's 20-Great Grandfather. `Osawatomie' Brown's 29-Great Grandfather.