Jan Dirk Johannes was born in 1889. He is the son of Jacobus Stephanus Johannes Schmidt and Nonnie Watson. I think this is where the Schmidt family became the Smit family of Smitsdal, at Barkly East.
Sources
[1] Baptism record on 7 April 1890 in Barkly East, Cape Colony. The witnesses were Jan DIrk Johannes Smit (Schmidt) and Susanna Maria van Jaarsveld.
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DNA Connections
It may be possible to confirm family relationships with Jan Dirk Johannes by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Jan Dirk Johannes: