Here is a plan: (Joke) get an automatic weapon, plenty of ammo and pretent your a Navy Seal, crash the party, shoot away and then burn the house down.
Hmmm!, really bad idea but you might feel good for about 3 minutes, so don't do it, I'm joking.
Follow the advice of others with good judgement. attempt to work it out with the mom and kids, document everything, find out what the city rules are, get the police to enforce the law.
One thing don't get mad and fight with the kids..they will do something very creative like toss 100 beer cans in your yard, take out the mail box, or out water in your gas tank.
(Maybe you can convince them to leave you a couple of cases of beer for a party favor).
Good luck with the momless kids
