i know u feel so bad... but if u can trust him in a way that he wont get drunk... his body is strong... its normal, in the end everyone will drink...
i know i dont have the right to comment coz im not a parent or anything, but i love children, and for me they are the only reason to live...
In the end, u cant forbid him from drinking... u can be there 4 him if he needs u...not more... i know u r suffering, but it would happen sooner or later...