Keys1930–1930Nama dan MargaJohanna Cathrina KeysLinimasaBirth1930Death1930HubunganSaudara kandungKeys (1920–1980)Keys (1920–1970)Orang tuaJoseph Alexander Buller Keys (1901–1957)Magdalena Johanna van Zyl (1905–1968)Sumberwikitree Keys-2555