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The probability of detecting different types of cousins

Because there is randomness when DNA is transmitted from parent to child, the more distant a cousin pair the less likely they are to share any stretch of DNA that was passed down through the generations. Note that even though there is a relatively low chance of detecting more distant cousins, DNA Relatives will likely find a good number of them given the large number of distant cousins that exist.

We estimate the likelihood of detecting a known cousin to be:

Cousin relationship Probability of detecting
1st Cousin or closer ~100%
2nd Cousin >99%
3rd Cousin ~90%
4th Cousin ~45%
5th Cousin ~15%
6th Cousin and beyond <5%

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