Poss. HRH Charles's 19-Great Aunt. HM Juan Carlos' 21-Great Aunt. Philippe of Belgium's 21-Great Aunt. Grand Duke Henri's 21-Great Aunt. HM Margrethe II's 20-Great Aunt. HM Beatrix's 15-Great Aunt. Wm. von Bismarck's 12-Great Aunt. `Red Baron' Richthofen's 13-Great Grandmother.