This is the most common question asked by many parents these days. Being known that their son is alcohol addict, any parents will eager to know the right way to help them. Addiction is a terrible disease which can be a cycle of self destruction and can lead anyone toward death. That’s why it’s important to take essential step early so that it gets control overtime.  
1.    Talk to your son positively, do set boundaries and let them aware about the harmful effects of alcohol on their health.
2.     Don’t force for anything, just simply spend time with him and keep him busy in some activities during spare time.  
3.    Take professional help, there are rehabilitation center like Greenestone where therapist will do intervention and give effective treatment for it.
4.    Boost his confidence to make a real change in life.