Family records, The Kothmanns of Texas (multiple published versions from 1931 to 2016)
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DNA Connections
It may be possible to confirm family relationships with Wilhelm by comparing test results with other carriers of his Y-chromosome or his mother's 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 Wilhelm: