HM Juan Carlos' 17-Great Aunt. Philippe of Belgium's 17-Great Aunt. Grand Duke Henri's 17-Great Aunt. HM Margrethe II's 17-Great Aunt. HM Beatrix's 13-Great Aunt. HM Constantine II's 14-Great Aunt. HM Carl XVI Gustaf's 14-Great Aunt. Wm. von Bismarck's 15-Great Grandmother. `Red Baron' Richthofen's 11-Great Grandmother.