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While, most of the time, they are not too far off, the data can be skewed. Now I have to find time to study more and try to step through with what I learned today. Thank you so much So much to learn on researching DNA. One of the most confusing aspects of DNA databases such as 23andMe and AncestryDNA are their assumptions of how you relate to a DNA match. I feel I have a better idea of what matches mean when I have a 4th cousin match. Starting with 4th cousins and going further, you should take DNA Matches with a grain of salt, and look for additional pieces of information as an indication on whether a family connection exists (such as shared ancestral surnames, or similar geographical locations between their family tree and yours). This ISOGG page says:įor relationships at the 4th cousin once removed to 5th cousin level you may need 10 to 20 or more cousins tested in order to start drawing valid conclusions, assuming that you are dealing with a non-endogamous population. When someone has a 4th cousin they share a complete set of Great-Great-Great Grandparents (3rd Great Grandparents). If the DNA experts would let me know how I did on Phillip and Christina's triangulation and documentation thereof, I'd be much obliged. As I’ve said in a previous article, you may have to weed through hundreds of matches in, say, the 4th cousin range, to identify your actual 4th cousins, so matching doesn’t necessarily serve you up fully-identified relatives on a silver platter. 23andme has about 5 million genotypes in their database, and they will report about 1,000 of them as matches to you. The first one I tackled landed me at a triangulation on Phillip Hamman and Christina Cook via the test kits of three individuals (one of whom is my mom). Any of them could be your fourth cousin, but most are probably quite a bit more distant. I have just begun attempts to triangulate autosomal DNA matches.