HM George I's 8-Great Half-Aunt. HRE Charles VI's 10-Great Half-Aunt. HRH Charles's 16-Great Grandmother. PM Churchill's 16-Great Half-Aunt. Lady Diana's 17-Great Half-Aunt. HM Juan Carlos' 16-Great Grandmother. HM Margrethe II's 15-Great Half-Aunt. HM Beatrix's 15-Great Grandmother.