I have a concern, and want only serious answers on this one, preferably a lawyer or law school student...?

My best friend throughout high school was married for 6 or more years to a guy, she and him struggled for years to concieve a child, they decided that since they could not bring a child into their lives (she has a hormone inbalance) well they finally got a divorce, they were separated for 2 years before the divorce. Well I just found out she is now 2-3 months pregnant, which is great, my problem she is engaged to the father who just happens to be a registered offender, and had 2 counts of statutory sodomy on his daughter. My friend also knows about this. Their wedding is this weekend (I AM NOT ATTENDING, by the way) and I was told by her that his parole officer WILL NOT allow children at the wedding, which I understand. Now I am not sure if the parole officer knows she is pregnant or not, I am thinking not. I am very concerned for the child. How would I go about keeping that disgusting bum away from that baby?