Looks like the father knows the consequences of his son's action and he just wants to guide him no matter what the scenario is, we don't appreciate this kind of love from our parents until they are no longer here with us and by that time we realize that no one has ever been truthful to us except them. He should always listen to his father and learn to be contented in his life since they all have the means to survive. If he accepted it, I'm sure it won't be the last time the son does it and until the whole family is addicted to it.
I can relate to this because I have a very religious family that strongly forbid world things such as gambling. I don’t understand too the logic of the son here on why he needs to tell the father where the money came from while he can just give him a portion of money slowly so that he will not be suspicious on the money he is holding.
It’s dumb to become honest on things that was supposed a blessings while religion is the only thing denying it. I think my father will do the same to me if he knew that I’m gambling online. Sometimes secret saves relationships like this example.