HRH Charles's 12-Great Grandmother. HM Juan Carlos' 15-Great Aunt. Philippe of Belgium's 15-Great Aunt. Grand Duke Henri's 14-Great Aunt. HM Margrethe II's 12-Great Grandmother. HM Beatrix's 11-Great Grandmother. HM Constantine II's 12-Great Grandmother. HM Carl XVI Gustaf's 13-Great Grandmother. Ksr Wilhelm II's 10-Great Grandmother. Wm. von Bismarck's 9-Great Grandmother.