Not one to judge other people's parenting but I've just seen a friend of a friend post a holiday photo with the caption 'a couple of beers with this one tonight at the beach' and a photo of their son with a can of lager. The kid has just turned 12. They often post photos of family barbecues and he regularly has an alcopop or cider in his hand.
I'm not strict and may allow my 13 year old to have a drink with us on a special occasion if he expressed a desire to. But it would only be one and it wouldn't be a regular occurrence. As it happens he never has expressed any interest so it hasn't happened.
I understand that it's better to do it in a controlled environment than ban something totally and make it forbidden fruit territory. But even so, is 12 not a little young to be regularly drinking alcohol with your parents?