What would be needed to prove a case of actual second cousins or closer that don’t share DNA? You would need ALL of the following elements without any one element, you have NOT proven the case: (Also see “ Are There Any Absolutes in Genetic Genealogy?” for more). There are claims out there, but they are completely unsupported at the current time. This is especially true when testing two people who are second cousins or closer, as t here has NEVER been a single demonstrated case of second cousins or closer who fail to share DNA. Let me re-phrase that: no one has ever demonstrated second cousins or closer that fail to share DNA at a level detectable by one of the three testing companies.
For example, both DNA test results and traditional genealogical records can reveal misattributed parentage, adoption, health information, previously unknown family members, and errors in well-researched family trees, among other unexpected outcomes. Genealogists understand that DNA test results, like traditional genealogical records, can reveal unexpected information about the tester and his or her immediate family, ancestors, and/or descendants. Just as a census record or birth certificate can reveal a family secret, so can the results of a DNA test. The Genetic Genealogy Standards, for example, make clear that unexpected results can occur:ġ2. This is as true with DNA evidence as it is with any other type of genealogical evidence. Just because you as a genealogist may be prepared for the result does not mean everyone in your family will be. Ask yourself (or your relative) before diving into the research whether you really want to know the answer, and whether you think you are prepared for it. Caution should always be taken before pursuing an answer to a genealogical question.
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