My son (18) is a responsible young man. I have no problems with him at all. No drugs or alcohol, good grades etc.. He had a girlfriend (17) who broke up with him and during those three months, she went buck wild; hanging with the wrong crowd, smoking and drinking. Well her mom calls my son to pretty much reign the daughter back in, which he did. So now (against my wishes) they're a couple again. The mom calls my son for everything when it comes to her daughter, ie., pick her up from school, take her back and forth to work. They're together all of the time. Tonight is his prom. At first her mom said no, her daughter could not go. I told my son to take somebody else. Mom changed her mind. Well the plans after the prom is, my son, his gf and another couple are to come to my house for the night, then leave for the shore tomorrow morning. Once the mom found out (yesterday) who the other couple was, she went completely batshit crazy and now is threatening to not let her daughter go to the prom if I allow the other kids to stay at my house. My son is completely beside himself now because he could have made plans with other friends. I have met the other young man who I find to be mild mannered and pleasant. Apparently, the other girl (I have not met yet) is one of the "wrong" crowd goers and she's the one the mother absolutely can't stand. Granted I'm not going to be there so there will be no supervision, however, I'm not leaving the house tonight until they get there, so I can make sure there is no drugs or alcohol. I will literally be 5 mins away. Any advice ladies.