I don't know how things work where you are, but look into a harresment order, it works the same as a restraining order. Just a restraning order is used for more family issues, a harresment order you can use on a neighbor. I haven't went that route yet because I can't prove anything, but the cop in town told me I could go to the court house and have one against the neighbor.
If you are wondering what my neighbor does, she picks fights, she killed my birds, which I know cuz since I put up a 5 foot fence around he coop and a tarp on top, I don't have one dead bird! She called th board of health saying I don't take care of my birds, which he found I was the cleanest chicken owner he hs ever saw!
Any way look into that and I would video tape her son or call the state and see if you can get the joints tested for dna.
Good luck this is not an easy thing to deal with, just make sure you go the legal way, cuz if you do something to her that is not legal to get revenge she could end up getting you in trouble!