Can Siblings Have Different DNA Ethnicity Estimates?

If you are learning about DNA, there is an interesting article in the MyHeritage Blog that you might want to read:

“It comes as no surprise that when two siblings are DNA tested, their results will usually be similar. What is surprising to many people, though, is how two siblings (not twins) with exactly the same parents and ancestors can receive different ethnicity results. After all, identical ancestors should give identical ethnicity estimates, right?

“Well, it’s not that simple. In fact, it’s rather common for siblings to have different ethnicity estimates. There are several factors that can affect genealogical ethnicity. We’ll take a look at those factors here.”

Also, if your DNA results say that you have 15% Irish ancestry (or any other ethnicity), You should interpret that as being ABOUT 15%. Ethnicity tests are not super precise. A second text by a different company might say 12% and a third test by a third company might report 22%. Ethnicity report are ALWAYS approximate. All three reports from the different testing companies will be correct.

You can read all about this at:



Great article today for people like me who need more basic info to understand DNA testing. Thanks.
Kathy Casey
Sent from my iPhone


Even with no full siblings, I get different results from 5 Big DNA companies. Huge differences when it come to British.


Reblogged this on Old Bones Genealogy of New England and commented:
Interesting blog post written in simple language. Click the link in this article to read the entire MyHeritage blog that Dick Eastman is sharing here.


Etenicty is a quesstimate based on many factors. The more known data the better the quesstimate.


I understand how siblings can have different results. What I have recently found and don’t understand is how my daughter can have a DNA match to someone in my husband’s line but my husband doesn’t have a DNA match to that person. Both tests were from the same testing organization. I have also seen this happen with a nephew and my brother – Nephew DNA match in my family line but no match to my brother.


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