Let's say both cousins are related through their grandmother on their fathers' side, but neither have parents or grandparents still alive... so that rules out the possibility of getting a dna sample from them. But if 2 cousins were to take a dna test themselves, is it possible that they could determine whether or not they had the same grandfather on their fathers' side?

Let's say both cousins are related through their grandmother on their fathers' side, but neither have parents or grandparents still alive... so that rules out the possibility of getting a dna sample from them. But if 2 cousins were to take a dna test themselves, is it possible that they could determine whether or not they had the same grandfather on their fathers' side?

My crazy mother is concerned that there is a ridiculously small chance that my adopted brother might be dating someone that may be related to him without knowing it. My brothers parents were Irish and the girl he is dating is Irish, so she automatically assumes the worst and thinks that they could be related. Is there some sort of DNA test that can be done to see if by any chance they might be related without having to tell them? Can you collect hair or something and send it to someone?

have had a DNA test done (16 marker) is it possible to tell what country my parents came from from these result ?

I just learned today after being alive for nearly 26 years, that I have a 27 year old half brother. Well, all of a sudden, I don't trust either of my parents. Unfortunately, my father died, so I can't test myself with him. Can a DNA test tell if I'm related to my sister via both parents? I have a sneaking suspicion that one of us is going to be from a different father.

i heard of a case but i dont know how to solve it because i dont know the exact laws.
can someone who is a criminal ask for the dna of kids who arent legally his without both parents permission? example if two married cuples cheated on each other but the women got pregnant of the lover.Can the lover ask for a dna test of the children without the parents consent?

Here's the scenario: two identical twins are separated at birth. One of them dies in an accident, the other one finds out, comes back and claims to be the first one and that the death was faked. If the parents, understandably, don't believe them right away and want proof, would a DNA test show that the twin was the same person as the one who died? Grisly scenario, I know, but I have a weird imagination.

Let's say both cousins are related through their grandmother on their fathers' side, but neither have parents or grandparents still alive... so that rules out the possibility of getting a dna sample from them. But if 2 cousins were to take a dna test themselves, is it possible that they could determine whether or not they had the same grandfather on their fathers' side?
ok, I realize that, but if they had the same grandparents, wouldn't 50% of the cousin's blood be similar enough to warrant an answer?

Let's say both cousins are related through their father's side, but neither have parents or grandparents still alive... so that rules out the possiblity of getting a dna sample from them. But if 2 cousins were to take a dna test themselves, is it possible that they could determine whether or not they had the same grandparents on their fathers' side?