My mother's half brother and I both submitted DNA samples to Ancestry. His came back 393 cm related to me. Mine came back 795 related to him.

Why would there be such a large difference?

  • I have never seen one person match another with a different cM value than the reverse. Are you sure you are reading the AncestryDNA results correctly? Please describe the precise steps you are using to do so but take care not to display the names or other identifying information for any individuals who are involved.
    – PolyGeo
    May 1 at 19:33

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