I've seen both extremes at our Kingdom Hall:
There was the dry gang - all the time, including wedding receptions.
Then there was the wet gang - all the time, every time. Probably always consuming beyond what the average person would consider 'moderate' amounts, but these were relatives of 'heavy' elders and were never...EVER spoken to or counciled in any way.
On another occasion, a few elder's sons almost got my brother and I arrested for supplying minors with alcohol. They had it, we didn't know it....then the cops came. We probably shoulda spent the night in jail....because of underage elder's kids. Certainly 'presiding over their household in a fine manner.'...or however that reads.