What he does is not your responsibility. Instead of driving him, why not tell him if he leaves in a car or on the bike, you will call the police and report him for driving while drunk. Others here have had to do that and, while a difficult thing to do, just might save his life or the life of another innocent person. In the meantime, have you thought about how long you intend to live like this? It's pretty obvious he isn't going to change, so don't you think that you and your children deserve better? Just some food for thought.