According ISSOG Wiki, the rate of an NPE is at a median of 3.7 %
There are many reasons that an NPE could have occured, aside from the obvious conclusion that ones mother may have been unfaithful.
I hope that this post can help others out there find some information about these possibilities. One piece of advice that I have to give to anyone who is thinking of getting your DNA tested, you must be aware that skeletons do sometimes come out of the closet. You have to ask yourself how you would react if you found out something as serious as this? Could you live with that fact? It is life changing. I never thought I would be sitting here writing a post such as this and had this very thing not have happened to my husband, I may not have. I think I have shared in previous posts about how he found out he had an NPE in his family line. Back in 2010 he had his DNA tested. When his results came back he was floored to say the least. His situation is unique. The first thing you automatically think of is could he, himself have been adopted?
I think for the most part we have ruled that out. It looks in his case as though either his father or his grandfather was adopted or for want of a better term, the product of a Non Paternal Event.
In his case he matched a gentleman on 36/37 markers at Family Tree DNA. His relationship to that man was calculated as follows. (In order to maintain privacy out of respect to the Biological family I have opted to block out identifying details in the screenshots):
As you can see according to the results above this closest match could have likely occurred anywhere! In order to narrow it down,my husband has submitted a sample to 23andME. We are currently waiting his results there. We are hoping to narrow it down even closer since 23andMe gives results that are closer in generation than those further out as you get through testing with a Y-DNA test.
Our problem is we know where his Biological Family is. We have even had email and phone conversations with them. We have exchanged pictures with them but neither of us have any idea which of those gentleman in their family fathered my husbands contributor. At this point I cannot really say his father or his grandfather,we do not know who it was that was the first male of this family line in my husbands family. It is like a big jigsaw puzzle and DNA is only one small piece of this puzzle. Hopefully after the results come back we will know more.
In my search for relationships I found the above chart which I am sharing here below as well. It helps you to figure out where to place those autosomal matches:
This chart came from the Wikipedia Commons file and is considered Public Domain
If you notice in the chart above the average percentage for autosomal matches at each relationship shows. For example we can see that a Father is likely to share 50% of your genomes as would a brother or sister.I hope it makes it much easier for you to see how closely you are related to someone, I know it helps me to sort of look at the big picture and know where to look for those matches in relation to my paper tree.
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