HM George I's 20-Great Grandmother. Poss. HRE Ferdinand I's 18-Great Grandmother. HRE Charles VI's 25-Great Grandmother. U.S. President [HAYES]'s 20-Great Grandmother. PM Churchill's 26-Great Grandmother. Lady Diana's 24-Great Grandmother. Poss. Agnes Harris's 20-Great Grandmother. `Osawatomie' Brown's 27-Great Grandmother.