Hi. I am so sorry to hear of your story and the obvious stress it has and still is causing you. Be prepared to fight - when I say that if your ex is a narcissist they will do whatever it takes to win because they will never accept to lose. Stay in control of your emotions (if you can) and play the game the right way. Try not to anger him, contradict him, criticise him or anything else that could set off a rage episode as that will not be worth it for you or your son. I have learnt from living with my narcissistic H that if I want any semblance of a "normal & harmonious" life I just have to bite my tongue and control my anger. If you can stay in control in that way it will give you more strength and allow you to think clearer and not emotionally overreact as I have done many times with regret. Speak with someone who can give you advice regarding the legalities etc and please remain calm and rational because he will swoop if he can see your weaknesses. It may be a difficult and long road ahead but stay true to yourself, never give up hope and take each day as it comes. All the best