Poss. HM George I's 29-Great Uncle. U.S. President [NIXON]'s 20-Great Grandfather. HRH Charles's 20-Great Grandfather. PM Churchill's 20-Great Grandfather. Lady Diana's 20-Great Grandfather. Poss. Agnes Harris's 13-Great Grandfather. Poss. `Osawatomie' Brown's 17-Great Grandfather.