Poss. HM Juan Carlos' 17-Great Aunt. Poss. Philippe of Belgium's 17-Great Aunt. Poss. Grand Duke Henri's 17-Great Aunt. Poss. HM Margrethe II's 16-Great Grandmother. HM Beatrix's 13-Great Grandmother. Poss. Wm. von Bismarck's 12-Great Grandmother. `Red Baron' Richthofen's 13-Great Grandmother.