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It may be possible to confirm family relationships with James by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Bob Brodie :
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-M269, FTDNA kit #B77272 +
Y-Chromosome Test 91 markers, haplogroup R-Z9
It is likely that these autosomal DNA test-takers will share DNA with James: