Mike's Rule #6 - Understanding the DNA you share
The amount of DNA you share with a match is measured in centiMorgans, represented with a little c and a big M. This amount can be roughly translated into how you are related to your match. For example, a parent and child share about 3400cM. Third cousins share about 53cM. There is a great chart at the International Society of Genetic Genealogists that provides a reference. Link DNA Reference.
Say that you and your match share 106cM. If you are the same generation as your match, you may be half second cousins. If you are different generations, then you are second cousins once-removed (your parent’s second cousin). What if you have a 265cM match? This falls between cousin categories. This amount of DNA could represent a double cousin. One portion of the match at 212cM, representing a second cousin. Plus 53cM, representing an additional third cousin match. It happens, I’m proof.
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