I agree with the above posters. He has done this before. Why wait until next time someone is hurt? You would be beating yourself up saying "I should have known better"
I hope you realize the potential this has to have someone seriously hurt or killed. This is not a joke. Why are you willing to gamble with your kids' life?
I would be packing too and taking the kids. The alcoholic's word don't matter. They lie and manipulate to keep the status quo.