Poss. HM George I's 20-Great Grandmother. Poss. HRE Ferdinand I's 18-Great Grandmother. Poss. HRE Charles VI's 22-Great Grandmother. Poss. U.S. President [WASHINGTON]'s 25-Great Grandmother. Poss. PM Churchill's 28-Great Grandmother. Poss. Wm. von Bismarck's 25-Great Grandmother. Poss. Agnes Harris's 30-Great Grandmother.