What do you say?
A good idea is to reassure the neighbour that he did the right thing and it will help your son to stay out of trouble. Then explain to your son that you want to talk because you're concerned he may be buying and drinking alcohol when he's under age. Always give him a chance to tell his side of the story. But, if he doesn't volunteer any information, you may need to tell him what was seen. If you want him to be honest with you, then it's best to be honest with him.
Talk to your son about what you think is acceptable with regard to drinking and why; and you may need to remind him that it's illegal for him to buy alcohol. Ideally you'll already have discussed this and agreed some rules. Try to avoid being heavy-handed and laying down the law, and make sure he realises you're concerned because you care about him. It's important that he knows the facts about alcohol, and feels he can say 'no' if there's pressure from his peers.
