HRH Charles's 16-Great Aunt. HM Juan Carlos' 15-Great Aunt. Philippe of Belgium's 15-Great Aunt. Grand Duke Henri's 15-Great Aunt. HM Margrethe II's 15-Great Aunt. HM Beatrix's 15-Great Aunt. HM Carl XVI Gustaf's 15-Great Aunt. HM Harald V's 14-Great Aunt. Ksr Wilhelm II's 14-Great Aunt.