oomis: So then if your son has friends from yeshiva for shabbos, will you not give them a little cup of kiddush wine?”
My son and all his friends are well over the age of consent for alcohol. That said, when they were much younger, we generally only served wine on Pesach at the Sedarim (and therefore not shayach to this discussion), and grape juice on Shabbos. I never put bottles of alcohol on our table when the kids were under age. Nonetheless, had I done so and had they drunk some kiddush wine (under extremely careful supervision, and no more than to be yotzai), it would have been under the purview of religious observance.