I have a half-sibling who took one of those tests not knowing his parents went to a sperm bank due to fertility issues, so he assumed his mom had an affair (and he’s not the youngest child). The rest of us all knew I think (except the sperm donor’s actual child). Fortunately, he had another one of my half-siblings reach out to him to explain it.

Also “Turned out my father isn’t my real dad” is BS. Genetic test results are useless for determining such.

Genetic tests can be used to determine paternity though?

en.wikipedia.org/wiki/DNA_paternity_testing

Maybe you are referring to a specific type of test?

DNA paternity testing - Wikipedia

Who is your father, the one you would rely on when you need a paternal figure, the dude who shoot his sperm or the dude who raised you? Hopefully both dudes are the same person but in the case they aren’t, I think the answer is clear.

I’d be surprised if adopted kids don’t consider the people who raised them as parents as their actual parents.

I mean first one might just be a father figure, second is the biological father and the third might be a step-father. All fathers of sort
You would be technically correct with the first two, but adopted kids are not step-kids. Those aren’t are legally full parents, not step-parents. Step-parents might be the boyfriend or next husband of a single mother or vice-versa, but once you are adopted, if we are getting pedantic about it, the step thing disappears.
Oh okay, i just thought it came from not being the biological father