Poss. HM George I's 15-Great Grandmother. Poss. HRE Charles VI's 16-Great Aunt. U.S. President [TYLER]'s 19-Great Grandmother. HRH Charles's 23-Great Grandmother. PM Churchill's 22-Great Grandmother. Lady Diana's 23-Great Grandmother. Poss. Agnes Harris's 18-Great Aunt. `Osawatomie' Brown's 20-Great Grandmother.