There are links to the Al-Anon site on the main page and a sticky that explains what goes on at meetings.
It might be helpful to ask some adult children of alcoholics here what it was like for them growing up. I have had my eyes opened by listening to their stories.
I'd also talk to an attorney re the business, etc. The first hour will be free and you will learn a lot. My first trip to an attorney gave me the strength to take the next step.
It was the same for me - 15 years of relative calm and 2 years of absolute hell. It is a progressive disease.
Good luck and take care.