Sure enough, we found a match descended from a brother of Sarah Annie and Rosa who was on both our match lists sharing a reasonable amount of DNA with both of us. Such a match could help in confirming that neither of us have a break in our biological line.
Does this mean there is a different relationship, not third cousins on the Clark line, that is the real relationship? Is there STILL a big family secret? We scanned our match lists for a key match-a descendant of Annie and Rosa’s siblings-someone we would both match but is independent, not descending from either Annie or Rosa. In fact, this amount of DNA has only an 8.87 percent probability for third cousins. You might also notice that Carolyn’s dad and my aunt share a low amount of DNA for their proposed relationship. This is why it is so important to test multiple relatives and examine each of their DNA match lists when solving a DNA mystery. You might ask why I share no DNA with Carolyn’s father when my aunt does? My aunt’s DNA contained segments that either my mom did not inherit or that my mom did not pass on to me. With relief, we discovered her father shares 28.7 cM of DNA with my aunt. If they shared no DNA, then it would be time to consider the possibility of misattributed parentage on one of our lines. Almost 98 percent of third cousins share DNA. I knew my aunt had tested and uploaded to GEDmatch so I located her kit number and we compared my aunt to her father. We compared her father to me- third cousins once removed-and still no shared DNA. We decided to compare our DNA a generation closer. According to a study cited by ISOGG, there is a 30 percent probability fourth cousins won’t share autosomal DNA. It depends.īecause we get to analyze DNA results every day at Legacy Tree Genealogists, we knew that fourth cousins don’t always share DNA. What do you do when you know you should be related to someone but you share no DNA? Is the analysis tool wrong? Do one of you have a big family secret waiting to be discovered? It’s not the tool, and regarding a big family secret-maybe yes, maybe no. Why Don’t I Share DNA With My Known Relative? (Autosomal DNA includes all your chromosomes except your sex, X and Y, chromosomes.) The results were definitive. We moved to GEDmatch where we could quickly compare our kits in a one-to-one autosomal DNA comparison. Thousands of matches aren’t easy to skim through, especially while listening to a lecture. Maybe we had just missed each other while quickly scanning our DNA match lists. We logged into our AncestryDNA accounts immediately but couldn’t find each other in our match lists! What if one of us had misattributed paternity? What if one of us is not biologically a Clark?! I leaned over to her and suggested we use our shared DNA to begin mapping our Clark DNA. Not long after we made the discovery, we were sitting in a DNA chromosome mapping session together at Roots Tech.
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