HM George I's 12-Great Aunt. HRE Charles VI's 14-Great Aunt. HRH Charles's 17-Great Grandmother. PM Churchill's 20-Great Aunt. Lady Diana's 21-Great Aunt. PM Cameron's 19-Great Grandmother. HRH Albert II's 20-Great Grandmother. Louis XVII's 14-Great Grandmother. HM Manuel II's 16-Great Grandmother. Ksr Wilhelm II's 15-Great Grandmother. `Red Baron' Richthofen's 16-Great Grandmother.