I've mentioned our friends before and I'm still trying to gather insight.

He is now drinking alcohol within his meals. For example, liquor in coffee, rum cake, spirits in his soup. Have you seen this before?

The shaky hands. Is this a very common thing with alcoholism? It improves when he drinks.

Hard to guess how long all this has been going on.
Heavy drinking for a few decades.
Very heaving for at least five years.
Shaky hands a good three years.

Age: early 60s. Seems to be doing ok at work....but I suspect business is slowing down esp. in the last two or three years.