the thing about ancestry tests is that while they can tell you a lot about your own personal genetic makeup, there's a lot about your family history that they can't. so while his story sounds pretty typical of spicy white people, it's possible for you to have a great-grandparent from a certain region, but it doesn't reflect at all in your ancestry/23andme report, meanwhile your full sibling takes the same test and can read as 34% of something you have nothing of.
it's testing gene expression, so simpified, that sibling can have the cherokee genes while you have more scottish genes but it can be helpful for getting a general picture if you don't know anything about your family background
i think it has value if you're interested in finding out about your potential heritage, but it's more helpful if you have a lot of family members who also take it, so you can track your actual ancestry. my cousins and i were able to figure out who our great-grandfather's father was, and we discovered our grandmother had a half-sister she (probably) never knew existed. it's been really eye-opening!
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but it can be helpful for getting a general picture if you don't know anything about your family background
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