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I'm a 3rd generation Canadian meaning that my great-grandparents were from Europe and my grandparents are Canadian born.

I haven't completed my family tree yet but from the looks of it most of my ancestors were from England and a few from Romania.

I'm a little uneasy about giving my DNA away but I'd still like to know an estimate of my ancestry. How many generations back could give me this information? On one branch I was able to go back to the 1500s Yorkshire, England.

  • The current state of DNA databases produces geography correlations that are only really reliable at the continental level. A DNA test could be relied upon to tell you whether your ancestors were mostly European or not. Any finer detail has entertainment value only: sometimes it's right, sometimes it's not. (In other words, don't expect to get genealogical evidence out of admixture.) – JPmiaou Jun 28 at 3:09
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I don't like answering a question with a question but - how do you want to define ethnicity? Go back far enough and we are all, every single one of us, 100% African. Most people tend to refer to baseline their ethnicity a little closer than that! But even if you make an arbitrary choice of a specific, recent generation, the ethnicity might change on the generation before that. In this case, I guess I'm defining "ethnicity" as country of origin.

The DNA approach purports to come up with a quantitative derivation of ethnicity - yet all it actually measures is the similarity of your DNA to the DNA of people from those areas living today.

If you look at the percentage DNA that you inherit from various generations, see https://dna-explained.com/2017/06/27/ancestral-dna-percentages-how-much-of-them-is-in-you/ then at only 7 generations back, the average DNA that you might inherit from someone on that generation is less than 1% and is probably lost in the statistical noise and undetectable.

So DNA estimates of ethnicity are not going to catch minor contributions. But 7 generations back isn't that far back (5G grandparents, as I recollect) and we are all of us liable to make a fuss about a really interesting 6G-GF (say) - I know that I do!

What I guess that I'm saying is that ethnicity is always relative - it depends on which generation you're looking at, and can alter on the next generation back. There isn't a fixed definition and the methods for measuring via DNA are defeated by statistical reality. Best to keep to the paper trail in my view.

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