FLTC: I don't see how calling the Police on your daughter solves any problems. My daughter who is 20 has had friends over drinking when I've not been here even though it goes against the rules. And I have dealt with it. I would not consider calling the Police. Do you think that will help her? Do you think it will help your R. No! It will cause a further rift and she will lose trust.
Your daughter is acting out. She needs some guidelines, rules and discipline. She does NOT need a police record. you can't control what your ex does but you can control what you do. Be there for her.
Do not leave your son with her. She has proved herself unreliable. If you have plans on your w/e with the kids - get a babysitter. That's what the rest of us do. Its not up to your wife to switch w/es with you.
I don't think either of you handled things well at all.