Does every family have at least one alcoholic?

I used to think alcoholics were only in the movies but in real life they would have to have a couple drinks at 5pm. But now I’m learning about it breaking up marriages, causing a liver to lose most of it’s volume, causing people to pass out in public and to just die. Now I know at least one drinker whose body feels like it’s surrounded by a layer of water which is edema.
Do you think there’s one in every family? Even if you have to go to cousins or inlaws?