Poss. HM George I's 20-Great Grandfather. Poss. HRE Ferdinand I's 19-Great Grandfather. HRE Charles VI's 20-Great Grandfather. U.S. President [WASHINGTON]'s 25-Great Grandfather. Poss. PM Churchill's 25-Great Grandfather. HM Beatrix's 26-Great Grandfather. Poss. Agnes Harris's 20-Great Grandfather. `Osawatomie' Brown's 28-Great Grandfather.