Dear Mav
I never saw my father drunk my entire life, but he exhibited all the traits of alcoholism, including cirrhosis and esophageal varices at the end. They can be very good at hiding their drinking, if that is their drug of choice.
One thing is for certain. Alcoholism is progressive. That's 100% of the time.
In this day and age, there are all kinds of addictions people can fall prey to, including becoming obsessed with addicts. That is why I am an AlAnon'er. If I don't work my program, I easily go down a "rabbit hole" trying to rescue somebody who won't help themselves. I highly recommend you try that program.
Lastly, you didn't CAUSE it, you can't CONTROL it, you can't CURE it.