Family Law Questions? Ask a Family Lawyer Online.
I will try to best answer your question.
I'm sorry to hear that you are dealing with such a horrific situation.
I think you will need to make your case about father sexual abuse issues in court if he tries to seek any visitation.
If you attempt to falsify the DNA testing you could be prosecuted criminally for fraud at a minimum. In addition, if you are caught you will likely lose custody of your child. My experience has been nine times out of ten the person gets caught. I recommend bringing the real issue, father is a sexual predator, before the court in the costody proceedings. That is your real issue and your real concern. You are heading down the wrong path with attempting to falsify the paternity information.
I see people who lose custody all the time because of lies about boyfriends or girlfriends or other small stuff, but because person lied and basically committed perjury they lose any and all future credibility before the court.
I know this is playing not the answer you want to hear but is not honest and best advice to you. Please don't rate me negatively for being honest.