The children were under three years old at the time of their death, and were found at the Drimolen site near the Sterkfontein Caves.

They soon found two teeth of Australopithecus africanus, making Gladysvale the first new hominid site in South Africa since the 1948 discovery of Swartkrans by Robert Broom.

These fossils include, beside hominids, antelope, extinct wolves, giant zebra and monkeys.

[6] Dr Colin Menter from the University of Johannesburg, commenting on the hominid fossils from Drimolen, stated: “Discoveries at this site showed us that sex differences in Paranthropus robustus were greater than we had previously thought.

While there are some specimens from Drimolen that are just as large and robust as those from other sites like Swartkrans, there is a complete female skull that is distinctly smaller than the other, well-preserved specimens of the species.” [7] Eldest of three sons of Gabriel Keyser and Adelheid Dorothea Giesekke, André Keyser was married to Josina/Sienie le Roux and lived in Meyerspark, Pretoria.