HRH Charles's 13-Great Half-Uncle. PM Cameron's 15-Great Half-Uncle. HRH Albert II's 16-Great Half-Uncle. HM Juan Carlos' 13-Great Half-Uncle. Philippe of Belgium's 14-Great Half-Uncle. HM Manuel II's 13-Great Half-Uncle. Grand Duke Henri's 14-Great Half-Uncle. HM Margrethe II's 13-Great Half-Uncle. HM Beatrix's 13-Great Half-Uncle. HM Constantine II's 13-Great Half-Uncle. HM Carl XVI Gustaf's 13-Great Half-Uncle. HM Harald V's 13-Great Half-Uncle. Ksr Wilhelm II's 11-Great Half-Uncle.