Seems like some of the problem is that there are no *rules of the house* nor consequences for the unacceptable actions. Yes, these are all adults living here, but who is paying the bills? If you and hubby are helping to support these adult children and they are living in your house, you two have the right to set certain expectations of behavior while they live under your roof...and that includes a curfew. If they don't like the rules, they need to choose to live elsewhere. It seems as if there is a bit of enabling going on, albeit unintentional. The tactics employed by hubby and you have not been successful. Time to seek some help from a professional to try a new plan of action. It is not good for the little child in this household to live in such a volitale situation.