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Sources
Paternal relationship is confirmed through Y-chromosome DNA testing. Quentin Coffman, Dan's son, and Ronald Coffman, Dan's cousin's son, match on 66 out of 67 markers (see FTDNA IDs, N41261 and N145135) thereby confirming their direct paternal lines back to their MRCA Sylvan Goodrich Coffman.
Paternal relationship is confirmed with an AncestryDNA test match between Dan's granddaughter Teresa Coffman and Dan's paternal half-sister, Dixie Coffman Zehr. Predicted relationship reported by AncestryDNA: 1-2nd cousins based on sharing 474 cM across 15 segments; Confidence: Extremely High.
Footnotes
Acknowledgments
Thanks to Teresa Coffman for starting this profile. Click the Changes tab for the details of contributions by Teresa and others.
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DNA Connections
It may be possible to confirm family relationships with Dan 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 Dan:
Let me know if I can help with the wording. Thanks!