HM George I's 13-Great Grandfather. U.S. President [B, HARRISON]'s 16-Great Grandfather. PM Churchill's 20-Great Grandfather. Lady Diana's 21-Great Grandfather. PM Cameron's 21-Great Grandfather. HRH Albert II's 21-Great Grandfather. Louis XVII's 17-Great Grandfather. Poss. `Osawatomie' Brown's 20-Great Grandfather. Poss. Jamie's 20-Great Grandfather.