The strange part is that a father refuses his child's gambling winning money when they actually also need the money but there is no clear certainty why a father refuses money that they can use for survival and change their economy.
In my opinion, this is a good choice from his father, he does not want to receive winning money from his son's gambling results. After knowing this, I had the assumption that the actions taken by his father indirectly only wanted to let his son know that gambling was not good and would have a very bad impact on his personality and future. Even though on the other hand the family's financial situation is not good, in the sense that it needs money, and the father prefers not to use the money because he wants the best for his child. I think this is the reason for the actions taken by his father.