HM Juan Carlos' 16-Great Uncle. Philippe of Belgium's 16-Great Uncle. Grand Duke Henri's 16-Great Uncle. HM Margrethe II's 16-Great Uncle. HM Beatrix's 16-Great Uncle. HM Carl XVI Gustaf's 16-Great Uncle. HM Harald V's 15-Great Uncle. Wm. von Bismarck's 15-Great Grandfather. `Red Baron' Richthofen's 11-Great Grandfather.