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What is the Largest Block column?

April 26, 2017block column largest

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What is the Largest Block column?

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On the Family Finder Matches page, the Longest Block column shows the largest DNA segment in centiMorgans (cM) that you and your match share. When the largest segment is greater than 10 cM it is indicative of definite shared ancestry in the genealogical time frame. When the largest DNA segment is between 5 and 10 cM it indicates likely shared ancestry within the genealogical time frame.