Poss. Lady Diana's 18-Great Aunt. HM Juan Carlos' 18-Great Aunt. Philippe of Belgium's 18-Great Aunt. Grand Duke Henri's 18-Great Aunt. HM Margrethe II's 18-Great Aunt. HM Beatrix's 15-Great Aunt. HM Constantine II's 15-Great Aunt. HM Carl XVI Gustaf's 15-Great Aunt. Wm. von Bismarck's 13-Great Aunt. `Red Baron' Richthofen's 13-Great Aunt.