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When y-DNA confirms ancestry, why doesn't Family Finder have a fit?

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  • When y-DNA confirms ancestry, why doesn't Family Finder have a fit?

    I have just begun using Family Finder, after 40 years of extensive conventional genealogy research.

    Years ago, my y-DNA test confirmed a match with a male known by genealogical research to be a third cousin descended from my paternal great-great-grandfather (Samuel Paris McKinney).

    Now, Family Finder shows good overall matches with two people who can be shown through genealogical research to share that same paternal great-great-grandfather (Samuel Paris McKinney), but there is only one 6 cM common chromosome region among the 3 of us until you look at the 1 cM+ range, which adds two 2cM regions.

    I had expected a larger overlap. What’s happening?

  • #2
    You may each have inherited different DNA segments from your common great great grandfather.

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