To have a DNA test done

[Yourarejokingme]

Is it unreasonable of me to mention that son should ask for an DNA test with present girlfriend whom is pregnant and she was cheating with him and her now ex boyfriend at the same time.

Perhaps suggest something like relate to your son where he can go with his girlfriend to work through this and decide what they both want.

Fluffymouse - I agree that the facts are important, the OP (well, her son actually) needs to establish whether there really is a chance that the son is not the father before taking any action.

If there is a chance, then I do think that establishing the parentage is necessary. The child has a right to know who his/her parents are. I think this trumps the parents' wish to "sweep things under the rug." I appreciate that knowing parentage is not always possible, but in this situation it is completely possible to identify the father. Since the possibility is out in the open anyway, it would be the world's worst kept secret and likely the child would hear the rumor at some point in his/her childhood.

I agree with rainbunny it's for the child benefit they should find out it's parentage.