Quitting gambling is easy, lock the sites with a password and ask any family member of yours to put the password. Because when you can't access the sites how can you gamble there
This applied to some but not applicable to all. It may sounds easy though but if the gambler it getting to addictive and deeply involve with gambling and money it's hard for them to do it. There's no one who could really help them but themselves they need self realization and get closer to their love ones and especially to God. This I think would be the best way to quit gambling for good. 