John William Mark Barlow.
Source: Details: Ancestry Family Trees Citation Text: http:/trees.ancestry.com/ptAMTCitationRedir.aspx?tid=11159162&pid=-515519139. [1]
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DNA Connections
It may be possible to confirm family relationships with John William Mark 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 John William Mark: