HM Juan Carlos' 12-Great Uncle. Philippe of Belgium's 12-Great Uncle. Grand Duke Henri's 12-Great Uncle. HM Margrethe II's 11-Great Uncle. HM Beatrix's 11-Great Uncle. HM Constantine II's 12-Great Uncle. HM Carl XVI Gustaf's 12-Great Uncle. HM Harald V's 11-Great Uncle. `Red Baron' Richthofen's 11-Great Uncle.