HRH Charles's 10-Great Aunt. Philippe of Belgium's 11-Great Aunt. Grand Duke Henri's 11-Great Aunt. HM Margrethe II's 9-Great Grandmother. HM Beatrix's 8-Great Grandmother. HM Constantine II's 10-Great Aunt. HM Carl XVI Gustaf's 10-Great Aunt. HM Harald V's 10-Great Aunt.