Paternal relationship is confirmed by a triangulated group on GEDmatch consisting of Rob Judd, Kathy Rogers (3C1R), and Jenn Joyce (3C1R), who share a 19.6 cM segment on chromosome 12. The most-recent common ancestors shared by all three are James Spaulding and Abigail Smith.
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DNA Connections
It may be possible to confirm family relationships with Jack 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 Jack: