If you're going to take anyone to court, its going to have to be at the Federal level....the only caveat is this....you state you have kids......if you take them on they will most likely open a case against you and try to kidnap them. Discretion is the better part of valor. Let them stay with an out of state relative before taking them on.
There are a few ways to deal with them but you're going to have to educate yourself first! Macerico is right....they operate outside of any law but their own. If you wish to see lawlessness at work check out
www.avoiceforchildren.com