How do you see the father?
This kind of story looks like a made-up story since I read many instances like this online just to bring a real world case scenario of gambling to people virtue.
Yeah, the story sounds like the story in the drama series where the protagonist experiences extraordinary luck and then the people behind him do not believe.
I think the Father decision on this case might be based on religion or philosophy since I have a pastor that declined our church member money offering that came from a lottery win. Maybe the father on the story is holding in to something that makes gambling profit bad.
I think the father has enough money to feed himself and that the guy and his father has a misunderstanding and the father does not want any of the son's winnings due to pride. I do not think that there is such a person that will deny a fortune due to personal belief let alone it is coming from his son's effort (betting is an effort you know)
Was he right by rejecting the son gambling win?
On practicality, A money is a money so he should accept the money especially if they are poor since the son only risk very small amount just to get it. But in father perspective or if you are viewing this with same ideology then I think the decision is right since it’s based on what’s your life guidelines to determine good and bad.
It is his right to reject his son's money, wether it is ethical or not depends on the belief of a person. For me it is morally right to reject anything from an activity the a person believe as evil.