Nope I don't expect alcohol with friends unless it's been said but with family yes I expect alcohol. I don't drink often it's been a few years. Can't remember.
ETA- if dd was invited to a kids party and she was at an age I felt comfortable to drop and run and I realized there was alcohol and most adults were drinking to get drunk or already drunk I would either offer to stay or not stay and take dd home. I would also find that irresponsible.