Check with your attorney. I'm divorcing and in a similar position because my husband is a "functioning" alcoholic and had only 1 dui about 20 years ago. I'm "lucky" in that I have many, many witnesses to his excessive drinking, drinking while driving, drinking before driving, etc. My attorney (and lots of great people on this forum) have advised me to tell my kids they are NOT to get in the car with dad if he drinks ~ they are to call me immediately. Our next step then will be court, and given the witnesses I have, my attorney is comfortable he will not be able to see the kids without supervision if it goes that far. I know your twins are rather young to do this, but a lawyer could help you proceed in the right direction. In my state, Massachusetts, it's considered your obligation to report this kind of endangerment.