HRH Charles's 14-Great Aunt. Poss. Lady Diana's 16-Great Aunt. HM Juan Carlos' 15-Great Grandmother. Philippe of Belgium's 15-Great Grandmother. Grand Duke Henri's 15-Great Grandmother. HM Margrethe II's 15-Great Grandmother. HM Beatrix's 14-Great Grandmother. HM Carl XVI Gustaf's 15-Great Grandmother. HM Harald V's 14-Great Grandmother. Ksr Wilhelm II's 12-Great Aunt. Wm. von Bismarck's 11-Great Aunt.