Sounds like you have a very serious custody battle going on. I suggest that you contact a good family law attorney as soon as possible. Giving up the fight because one party threatens violence seems a little contradictory to the whole point of the fight to begin with.
Get a lawyer, pay the lawyer, call in favors if you have to, and start getting some solid advice.
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I'm afraid it's a bit hard to understand just what's happening from your description. (Please see this Guide: www.avvo.com/legal-guides/ugc/five-tips-for-how-to-ask-for-legal-advice-on-avvocom ) You should consult with an attorney in private.
I will say this: Child custody cases tend, at their core, to be "reasonableness contests." Your job is to appear more reasonable than the other guy. So violent and pushy tactics are deeply counterproductive. Every time a co-parent sends you a hostile text message, they're giving you a little gift, that you may be able to use against them. Don't respond in kind. Be scrupulously polite to them at all times - because, of course, all your communications might be read by a judge one day.
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