HRH Charles's 14-Great Aunt. Lady Diana's 15-Great Aunt. HM Juan Carlos' 15-Great Aunt. Philippe of Belgium's 15-Great Aunt. Grand Duke Henri's 15-Great Aunt. HM Margrethe II's 14-Great Aunt. HM Beatrix's 14-Great Aunt. HM Constantine II's 14-Great Aunt. HM Carl XVI Gustaf's 14-Great Aunt. HM Harald V's 14-Great Aunt. Ksr Wilhelm II's 12-Great Aunt. `Red Baron' Richthofen's 12-Great Grandmother.