You probably need to get a national resource to help with this since it's an unusual request. Try looking at the National Center for Victims and contact them and see if they have a specialist that you can contact. Also try thru your state's Legal Aide dept and thru your Domestic Violence Shelter. They have all sorts of situations they have had to deal with and they may have someone they have used in the past for that.
I agree with Willow. In fact, go to a Violence Shelter or someplace VERY similar. They will not only help you with legal counsel but will help keep you and your son safe.
It would help to know what state you are in...
You've got people here to help you; all is not lost or hopeless. You can feel free to e-mail me through Angela or directly. I am an advocate for safety and against abuse and will help as much as I possibly can.
Honesty. Integrity. Simple.