Is it too late to disprove paternity?

So, you want to have your cake and eat it too- after you smash it on the ground and stomp on it. It won't work. If you go through the trouble of disproving paternity, yes, you will be able to get off child support, but you will not be able to get full custody of your son unless there is a VERY good reason (e.g. the mother is extremely abusive and there is no other blood relative available to take your son) and the question of visitation will also be uncertain, as well. And what do you think it will do to your relationship with your son when he finds out that you went through a lot of trouble to find out that you're not related by blood...so you can be free of the obligation to support him?  You need to make a decision- do you want to be a dad, or not?  If the answer is you want to be a dad, walk away from the temptation to find out what might be an ugly truth. When your son is older, give him the option of a DNA test. But not now- not if you want to be his father. A paternity test result that proves you're not related to your son by blood could be the beginning of the end of your relationship with him- especially since his mom already makes it hard to co-parent.