That DNA ancestry stuff is for entertainment purposes only. Any relation to it and actual science is strictly coincidental.
https://thegeneticgenealogist.com/2007/04/25/is-genetic-genealogy-a-scam/
https://answers.yahoo.com/question/index?qid=20140425082329AA7jU5g
Our son found his half brother, much to Mr. Mercat’s chagrin.
“That DNA ancestry stuff is for entertainment purposes only. Any relation to it and actual science is strictly coincidental.”
Agreed.
But they’re a good cover story for getting peoples genomes into the Google global database. They didn’t invest in 23andme for nothing.
My second cousin subscribed to one of those things and found he was related at the level of "second cousin" to a person who had the same last name as me, but whom he had never heard of. Turns out is was my nephew, who would be his second cousin, once removed.
Also, cops use those services to find relatives of suspects whose DNA they have, so it's not total nonsense. One could easily make genetic profiles of certain ethnic groups and match individuals with these profiles (including means and variances) with a certain amount of rigor. From what I've seen, they are pretty reliable in finding relatives. BTW, by nephew's profile said that he was Scandinavian/Danish. His father was Danish.
I’d only be interested in mtDNA and Y-DNA, not the autosomal. Based on my haplogroups, I could tell if my distant ancestors turned left or right coming through Persia.