Poss. HM George I's 17-Great Grandfather. Poss. HRE Charles VI's 16-Great Grandfather. Poss. U.S. President [W. HARRISON]'s 17-Great Grandfather. Poss. PM Churchill's 20-Great Grandfather. Poss. Lady Diana's 22-Great Grandfather. Poss. PM Cameron's 22-Great Grandfather. Poss. Agnes Harris's 18-Great Grandfather. Poss. `Osawatomie' Brown's 18-Great Grandfather.