* SOUTH AFRICAN GENEALOGIES Pretoria Human Science Research Council 1986 [Reprinted by Genealogical Institute of South Africa Stellenbosch 2007] Vol "S" Page 385 under van Schalkwyk
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DNA Connections
It may be possible to confirm family relationships with Gerhardus Johannes by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: