Hi Taz,
To me this is a very interesting subject.
My Father's father was an alcoholic. No question there, my dad used to bail him out of jail because he was locked up again. He was the president of a bank and so it was pretty much all overlooked. He also left my farter and his mom when my dad was 10 or so. My father hated him. there is more to the story, but...
My dad was a workaholic. Oh sure, he drank, and maybe quite a bit. The only time I had any sort of one on one emotional time with him is when he had had a few. This was the only time he showed any emotion at all and he was happy, outgoing, and funny. He did seem to control it very well. I really don't know. Maybe I never will, and maybe that's the way it should be.
Taz, some things we may never know.