Spouse and I were bantering about "the rules" for serving liquor/wine when non-drinkers are in attendance. We invited a couple for a casual dinner and neither drinks - they met years ago in AA. I stated that since it was just going to be the 4 of us adults (+ 3 teen boys), DH and I should not serve nor drink wine (no big deal). However, if there were going to be more guests, say another couple, and they imbibed, then alcohol would be OK. The AA guests have not asked for a ban and they regularly attend events where wine is served.