I'm not a medical professional but I have a few years of biology behind me. When a sperm penetrates an egg, the egg sends out a membrane that prevents all other sperm from entering. Thus a child has one set of DNA from the mother and one from the father. Any "extra" sperm leave the body (unless there happen to be two eggs available, thus fraternal twins).

Once a baby is brought into the world (alive or not), that child can have only one set of DNA.

If a woman decides to have a child with another man then that second child's DNA will not match the father of the first child.

DNA evidence does not give 100% reliability (it's based on probablilty, a component of statistics and there are no such things as 0% and 100%) but it gives enough reliability that legal courts accept it.

I hope this helps you.

Good luck.

THANK YOU!!!!

Glad I could help. I looked at the other "Paternity" thread and couldn't believe the flaming! Good heavens!!

I'd never heard about a creature having dual paternity, guess I'll have to investigate same. AFAIK, human-wise, I feel confident that my answer is as correct as possible (statistically-speaking ).

it is possible in lizards and dogs and cats because their bodies and reproduction systems are very different than ours are

but yes your answer is right on the money

ahh the other thread...made me so so mad lol