i think it is not such an easy job to quit gambling and if you are addict of gambling , as i have seen so may people who have stopped gambling but then start it again after some time.
It will takes a lot of distraction to stop him from thinking about gambling. He may have stop it for now but you cant be sure it is not going to come back. By then, it really depends a lot of the family member to talk to him and help him over the addiction.