Lady Diana's 12-Great Aunt. HM Juan Carlos' 12-Great Aunt. Philippe of Belgium's 12-Great Aunt. Grand Duke Henri's 12-Great Aunt. HM Margrethe II's 12-Great Aunt. HM Beatrix's 11-Great Aunt. HM Constantine II's 11-Great Grandmother. HM Carl XVI Gustaf's 11-Great Grandmother. HM Harald V's 11-Great Aunt.