It is defeninately considered abuse to allow and to contrubute acohol to a minor child, it would fall under neglect. If you were seeking custody you would have an excellent case, and it would be in your sons best interest to get supervised visitaion for your ex. By the way what is a commitment meeting. I am not sure if it is the therapists resposnibilty or not but if you wanted to report you wuould have great back-up from him or her.
Good Luck,
Sandy