Living with an alcoholic is hard, to say the least.
husband has been "banned" from drinking since he decided to rage at Travis when the boy was 8. (he'd just crossed his path) He had his choice, Us or his Beer. husband chose us. There was no slipping on husband's part cuz I can smell alcohol a mile away, no matter what is done to cover it up. I meant what I said, husband was smart enough to realize it. Putting up with someone who drank himself into a stupor most nights was bad enough, but there was no way I was going to tolerate a violent raging drunk in my home.
I have to agree with BBK. The only way your husband is going to hit bottom is if you let him land there. With the condition of his parents, and his reaction to it, I'd say you're in for a much rockier ride ahead.
I can't tell you what you should do, nor will I. But if it were me, I'd sit down and try to take an objective look at the situation. Can you continue to live this way? Will you be able to tolerate it probably becoming much worse with his parent's health problems?
If you haven't done so already, you might want to get involved with Al-anon. They are a huge help to families of alcoholics.