My dad is a functioning alcoholic.
He is retired now, but as far as I know, never missed a day of work over it. Never got in a car accident drunk (or otherwise). Never had a problem with his partners because of it (although who can say what made my parents split up, ultimately).
In fact, my dad wasn't even around much (but did a one night a week visit and was there for every holiday).
I didn't even know he was an alcoholic till I was an adult.
And yet, I have boundary issues, codependency, perfectionism, and am married to an alcoholic (I dated one before I married one).
Hmm.
Stick around.