My father-in-law is an alcoholic. He has his own insurance business and is doing very well with it. He pays his bills, takes care of himself and his responsibilities, and is a generous and helpful person.
However, he is also a bit like @marinelife described above. In the morning, he is great. In the early afternoon, he is entertaining. By late afternoon and into evening, he is frustrating and sometimes turns into a complete asshole. He doesn’t get to the asshole stage every day, but when he does we all recognize it and know it’s time for us to leave if we are visiting. I feel bad for my mother-in-law sometimes because she has to live with him. At least he passes out falls asleep in front of the TV early, around 7:00, so she doesn’t have to put up with him long in that state.
When he knows he has something he needs to be responsible for, like if our kids are spending the night, he will drastically reduce the amount he drinks. If we’re at a big family party out of town, he will usually manage to control himself. If he has to stop drinking for a while because of some medication, he will. However, when he’s doing his usual thing and drinking from noon on, he can get to that point where he clearly doesn’t care about the effects of his words. If he says something to offend one of us, or is rude to one of the kids (and this does not happen often, but it has happened), he’ll call the next morning and apologize. When he is sober, he truly regrets what he’s said, but when he’s still drunk, he doesn’t care about anything.
So, I’d say he’s a functional alcoholic. He is not interested in changing at all. One summer, he seemed to be on a binge and was out of control almost every night. We had to ask him to stop coming over if he’d been drinking because it was awful to see him falling into the bushes or acting like a jerk and then have the kids ask what was wrong with him. One night my mother-in-law showed up at our house, fed up and talking about leaving him. At that point he was not functional. Since then, he’s had his act together quite a bit more.
It’s sad, because he is very smart and very personable when he is sober. I guess that’s why he spends each morning working very hard on his business. He can then take the rest of the day off to drink and yell at the commentators on Fox News or CNN.