Given two tests that share some cM of autosomal DNA, how can I easily find the predicted relationships that such shared cM would suggest? E.g., a 2,200 cM match suggests it could be either: grandparent, half-sibling, or grandchild.


This cool tool from DNA Painter project mentioned in this blog post makes it simple. It computes using the information in this chart from the August 2017 updated to the Shared cM project: enter image description here

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