How do you see the father? Was he right by rejecting the son gambling win?
This isn't about whether the father is right or not. This is about the father trying to save the future of his son. A male child who is living with his parents and is into gambling may still be less than eighteen and that is underaged betting. Imagine if this boy starts gambling at this age what belongs of him and his future. He should be out there learning a skill or acquiring some education that will improve his odds at succeeding in life and not the meagre money he has won from sports betting.
If the dad didn't do that, then he would have passed a message to his son that it okay to gamble and waste his time at a betshop when he knows that he should be out there chasing his dreams. Great parenting if you ask me.
That's probably right and it looks totally the correct move from a father figure to his son in order to school him about how bad gambling can be and that no matter how much one might have won at a time, it can still ruin one's life if the frequent interactions with a casino turn into an addiction when he grows up, that will probably be a nightmare for his father to see his son in that situation.
Parents will always do the best for their children and they won't change their minds only for money since money might buy everything and give them a better life but being parents, the happiness is to see their children grow responsible and become something in their lives.