Then if the firewall didn't work, then just simply cut off their internet access for them to avoid online casinos, but there are many ways on how you could gamble in the real world, and it is more tough when your kid is doing different gambling ways, and the good parenting is the only key for your kids not to open their eyes on this gambling world. The most common problem here is our child is the only who is making the real problem out of it, or just for gambling.
They are going to make different ways on how they are going to sustain their needs in gambling, for example is they will learn on how to steal things and they are going to sell it, for him to have money to be spend in gambling.