I'm so sorry you and your family are going through this. It certainly doesn't seem fair now does it?
My suggestion would be to contact your local victims witness advocate office for assistance with this issue. I think you are entitled to know exactly where your ex is being parolled to (if he is being paroled). If he has maxed out his time in jail, he can walk out a free man and go wherever he wants to go. Scary proposition.
Now is the time to plan plan plan. I know it's horrible to feel on pins and needles and having to look over your shoulder at every turn right now. But yours and your sons safety is the utmost of importance right now. Planning and having safety plans in place will help you feel a bit more secure at least in knowing that you are being proactive in this situation.
I wish you and your family safety and I pray your ex goes far away in another direction from you.

sabby