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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 ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Byron Williams :
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-DF27, FTDNA kit #B702328 +
Y-Chromosome Test 33 markers, haplogroup R-DF27, MitoYDNA ID Z10532[compare]
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John: