I really think you must find a lawyer to at least talk to him about what is going on. Have you guys signed any papers saying you cant hand her your son? Why would she call the police? To report what? I am confused. Maybe you should have somenody else present at pick-ups etc? Maybe have them in public places? I dont know, this all sounds so...frustrating.
I would reply to the email saying something like
"I dont understand why you would be scared since I have never given you a reason to be scared of me, Still since you are emotionally unstable (OK maybe not that mean) I will happily agree to limit our interactions cause when they are hostile from your side affect/hurt our son and I want to avoid that."
Ok, maybe I am a bit mad at your wife but still I would write something similar. Maybe some more experienced people could help you out with this. xxx K
