I'm just particularly furious because I had NOTHING to do with the situation. I don't even KNOW that older woman that my friend's been fighting with, nevermind her grandchildren, so why in the hell would they drag me into the mess?
You MUST call the cops, get them to come out and take a statement/file a report, whatever they do when they're not running RADAR...
Get the cops to talk to the neighbors involved, especially the older one who's grandkids are likely involved (to ask them if they saw anything, at least). Older people usually have enough sense to avoid police entanglements. Make it clear that there will be further police involvement if there is any further Rush-involvement.
You may also want to talk to the neighbor yourself, let her know you're putting up cameras and ask politely that they leave you out of whatever bulls*** is going on, since it is none of your business.
Pretty much, as politely as you can, make as clear as possible that you will not put up with any more of this BS, and you will make life Hell for anyone involved if it continues.