Funny you should mention DNA results! My brother sent in his DNA and, get this, they advised him that he (and we)had what could only be a sister down in Florida! Yep! They were right! Who knew!? Careful with this stuff, it can be dynamite...
That can easily happen and all of your female ancestors been faithful. England, Ireland, Scotland and Wales plus North Western Europe are hard to distinguish between because of all the migrations.
Now if it says you have a sister or brother you do.
Lost siblings, uncles, aunts and cousins are just some of the surprises these tests can spring on the unsuspecting.
The Mitochondrial DNA and Y-Chromosome tests are good and I believe reliable. The tests can also point out the degree of “closeness” different individuals can be. The percentage of ethnicity is just a rough guess.
After five generations the odds of inheriting any DNA from any one individual is minuscule.
The DNA thing can be just as much fun with dogs. I adopted my older dog as a puppy from a humane society that advertised him as half Great Dane and half Lab. When I took him to puppy basic training the trainer told me he was probably half Pit Bull and half Lab. However, by then he’d worked his puppy magic on me and I wasn’t about to return him. Then, a couple of years ago, I was dropping him off at the vet and I ran into a full blooded American Staffordshire Terrier (AST, aka Pit Bull) that, from dead on in front, looked very much like my dog.
That did it. I had the vet do a DNA test on him. Turned out that he’s half AST, a quarter Lab, an eighth Golden, and an eighth Cocker Spaniel. Quite a surprise, but he’s a great dog.
Yep, Dynomite! Just found 10 siblings as my ‘father’ wuz from a different “tree”. Family trees are typically NOT accurate... lots of family secrets...