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DNA Evidence with Ancestry

What I discovered about my own family tree when I charted my DNA matches from Ancestry.

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DNA Evidence with Ancestry

  1. 1. DNA Evidence Using DNA to Verify My Ancestry Tree Jamie Cox January, 2016
  2. 2. My Background • Using Ancestry for ~ 4 years • 1130 People on my tree • Mostly in Georgia, USA • I’ve Taken the Ancestry DNA test • Which of my research lines have DNA evidence?
  3. 3. Data Overload • 254 Pages of matches • (Over 1200 matches) • Two 2nd cousin matches • Eight 3rd cousin matches • 60 DNA Hints • 620 4th-6th cousin matches • 19 DNA Circles • (I have No “New Ancestor Discovery” Circles)
  4. 4. Back to Basics • What areas of my family tree are solidly backed by DNA evidence? • I have a lot of DNA matches that don’t match my tree • Are any areas wrong? • How to use all this data? • Ancestry provides very limited tools • I Decided to make a paper chart
  5. 5. Fan Chart
  6. 6. Grandparents
  7. 7. Great-Grandparents
  8. 8. GG Grandparents
  9. 9. 3rd GGrandparents
  10. 10. Mother’s Tree Brick Wall
  11. 11. Father’s Tree
  12. 12. DNA Circle
  13. 13. DNA Circle DNA Hint
  14. 14. DNA Circle DNA Hint Wow! No Matches to Paternal Grandfather’s Tree. Uh-Oh.
  15. 15. Chart Interpretations Absence of evidence is not evidence of absence • Am I the Last of the Mohicans? • What if I’m one of the only living descendants from this family, and there’s no one else to match … or… • My paternal grandfather’s folks don’t like genealogy/DNA • Unlucky DNA - My DNA happens to differ so much as to not be a match • Non-paternity
  16. 16. The Fourth Case DNA Match No DNA Match Trees Match DNA Hint or Circle Mismatch Alert! X No Tree Match “New Ancestor Circle” or regular DNA match unrelated, ignore
  17. 17. Non-Paternity Non-paternity - anytime someone’s actual parent(s) are not who we think they are • Non-Paternity Events: • Infidelity • Rape • Secret Adoption - a woman pretends a child is hers to protect the actual mother
  18. 18. Non-Paternity Rate Generation Opportunities for Error Total Opportunities for Error 1.2% 1.5% 5.0% Years Ago You 0 0 0 0% 0% 0% 0 Parents 1 1 1 1% 2% 5% 20 Grandparents 2 2 3 4% 4% 14% 40 GG parents 3 4 7 8% 10% 30% 60 GGG parents 4 8 15 17% 20% 54% 80 GGGGp 5 16 31 31% 37% 80% 100 … 6 32 63 53% 61% 96% 120 7 64 127 78% 85% 100% 140 8 128 255 95% 98% 100% 160
  19. 19. Next Steps • Test Family Members’ DNA • Father (deceased) • Mother ✔(Helps identify matches as maternal/paternal) • Siblings ✔(Complete, another random sample of Dad’s DNA, similar results) • 2nd or 3rd cousins ✔ • I’m looking for “cousins” who may not be cousins • Cousins on my tree who have done DNA test (Found 4!) • They don’t match my DNA - non-paternity confirmed • Y-DNA Testing ✔ - since my straight male line is now in question • NO matches to my surname
  20. 20. Help From ancestry.com • We need help with all this data, please • Ancestry should have drawn that DNA chart for me • need WAY more searching & sorting options • User-assignable tags & categories • AND/OR/NOT filters • Download DNA matches to spreadsheet

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