HM Juan Carlos' 11-Great Half-Aunt. Philippe of Belgium's 11-Great Half-Aunt. Grand Duke Henri's 11-Great Half-Aunt. HM Margrethe II's 10-Great Half-Aunt. HM Beatrix's 10-Great Half-Aunt. HM Constantine II's 11-Great Half-Aunt. HM Carl XVI Gustaf's 11-Great Half-Aunt. HM Harald V's 10-Great Half-Aunt. `Red Baron' Richthofen's 9-Great Grandmother.