HM George I's 15-Great Aunt. Poss. HRE Charles VI's 14-Great Aunt. U.S. President [TYLER]'s 16-Great Grandmother. HRH Charles's 20-Great Grandmother. PM Churchill's 20-Great Grandmother. Lady Diana's 21-Great Grandmother. PM Cameron's 21-Great Grandmother. Poss. Agnes Harris's 19-Great Aunt. `Osawatomie' Brown's 17-Great Aunt.