Tinkham, George H. History of San Joaquin County, California : with Biographical Sketches of Leading Men and Women of the County Who Have Been Identified with Its Growth and Development from the Early Days to the Present. Vol. 1, Historic Record Company, 1923. Archive, archive.org/details/historyofsanjoaq00tink/page/n5/mode/2up.
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DNA Connections
It may be possible to confirm family relationships with John 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 John: