I know a few.
A work colleague, lost her job and her husband left her once the kids were grown. She ended up homeless.
An old school friend. He got caught drink driving, eventually treated his long term partner (also an old school friend of miine) so poorly she left him. He frittered away the money from selling the house they'd bought (mainly with her income as his work become sporadic especially when he couldn't drive) but has found another woman to support him. I hear she's getting tired of him, though. He's a great laugh to be around for an evening, but you can't rely on him at all.
Brother in law. Also lost his license due to drink driving. Seems to keep it under wraps better than the others I know, goes on a bender a few times a year. Otherwise comes across as a middle class lush, but not someone with a problem. SiL makes excuses for him but he seems to have been a pretty shit partner in terms of pulling his weight and he's somewhat selfish in more ways than the addiction. Wealthy family, though, who have supported him financially and provided SiL with help, friendship and some lovely homes to take the children to when she needs to. So with the ability to stop the drinking spiraling (so far) they've muddled along as well as several other couples I know where no one is alcoholic.
A uni friend. Only one (I know of) who stopped. Built up from drinking in uni, then once working in early 20s wine with dinner most nights. Then kids came and wine with mums when they went out and a glass while cooking dinner and then wine with dinner, etc. Admitted she had a problem a few years ago. Tells me her marriage was on the line and she realised she just really wanted her family more than alcohol. Hasn't drunk since (didn't do it all by herself, joined a program, though think it wasn't AA).
Edited to add: Just remembered, also my grandfather. Became an alcoholic in the war. Died of a heart attack in his late 50s.