HP's PFA idea is VERY good. Not something I usually think about with respect to kids. Your son(s) should probably be the ones to file for it though, since they are the one being directly threatened. The PFA can include specific restrictions regarding contact while at school also.
(Escalation is not the answer here. For a lot of kids today, particularly the type that you are describing, there's a fine line that separates driving by someone's house and a drive-by ON someone's house.)
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