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You have not lost your firearms privileges at all. However, he can have nothing to do with firearms. That means that in your home, your 2nd Amendment rights have been abridged if you choose to have your son in your home. That is, you would not be subject to any criminal charges, but your son could be violated if firearms were found where your son could take custody and control of them.
So, as long as you are not keeping your firearms in your home or any place he could, such as your car and your son is not accompanying you when you hunt on separate property, you would not be putting your son's probation in jeopardy.