How do I read my Family Finder raw data file?

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Family Finder raw results files are comma-separated-variable (CSV) files. We compress them into GZ [...]

What are the possible relationships for a Family Finder match?

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This table shows the possible calculated relationship ranges.

Relationship Range Meaning

Immediate – Parent/Child, Siblings, Aunt/Uncle, [...]

On the Chromosome Browser page, what are the matching regions?

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On the Chromosome Browser page, the matching regions are half-matching DNA Segments that you [...]

Is it meaningful when two or more of my matches have a DNA segment or segments in the same location?

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Yes, you may all share a DNA segment inherited from the same ancestor. However, [...]

If I have two matches with over lapping DNA segments, how will I know if they have those segments in common?

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To tell if two or more of your matches have DNA segments in common, [...]

What exactly do the centiMorgan values for DNA segments mean?

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The centiMorgan (cM) values for DNA segments are measurements of how likely the segment [...]

How do you determine the centiMorgan value for a DNA segment?

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The Family Tree DNA Bioinformatics team works with centiMorgan (cM) data from the International [...]

Are there limitations to the current recombination rates?

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Yes, limitations in the number of global populations used and the number of samples [...]

Are the areas with extremely high and low centiMorgan values related to SNP Rich and SNP poor areas?

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No, SNP Rich and SNP Poor areas are due to the number and location [...]

If two DNA segments look about the same length, why aren’t they the same number of centiMorgans?

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The recombination rate across the human autosomal genome is highly variable. Therefore, DNA segments [...]

If two people share part of the same DNA segment with me, will the centiMorgan value for each segment be proportional to how long the segments look?

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Overlapping DNA Segments

cM
Matching on Chromosome 1

Match 1

Match 2

Non-Match

20.5

7.6

No, part of a matching DNA [...]

Is it more significant if two of my matches have identical start and stop points than if the segments simply overlap?

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No. When two of your matches’ DNA segments share exact start and stop points, [...]

You talk about matching DNA Segments. Is there a minimum number of matching segments in order for two people to be considered a match?

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Although the number and size of matching DNA segments are considerations in calculating how [...]

Does the Family Finder test use mitochondrial DNA (mtDNA) test results?

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No, the Family Finder software does not use mitochondrial DNA results for matching or [...]

Does the Family Finder test use Y-chromosome DNA (Y-DNA) test results?

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No, the Family Finder software does not use Y-chromosome DNA (Y-DNA) results for matching [...]

Does the Family Finder test use X-chromosome DNA (X-DNA) test results?

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No, the Family Finder test does not currently use X-Chromosome DNA (X-DNA) test results. [...]

My Y-DNA close match is not showing in my Family Finder matches, why?

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If both of you have taken the Family Finder test but do not match, [...]

I have a close match. We cannot find any common names or ancestors on my Family Finder match list. Why can’t we?

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It is both possible and reasonable for you not to have matches in common [...]

I used a third party tool to analyze my and a relative’s results. They are different from my Family Finder results. Why is this?

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When you compare two people’s Family Finder results using third party tools, it is [...]

Can I use the Family Finder test as a legal paternity test?

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No, the Family Finder test is not a legal paternity or siblingship test. The [...]