Johannes Gerhardus was born in 1897. He passed away in 1977.
Sources
Johan Viljoen
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DNA Connections
It may be possible to confirm family relationships with Hannes by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: