The individual that won has no obligation to gift money to anyone so what he gave was fine and the receiver didn't complain because there are some gamblers that'll win that much or more and won't give a dime to the punters. It was his risk and the punters had no part in his victory so why do people think he owes him any appreciations. By the time that gambler gets home he would have lost most of his profits if he keep giving them out to random People that ask.
The family members will also want a share of the money won as the news would have gotten home before he gets home. If I was the individual in this situation, I'll live town for sometime as the news would had circulated round town and I become a traget to evil individual that'll want to get a share of the money. The gambler should just look for what he'll Invest in to secure his profits and not spend it gifting it to people that wouldn't be appreciative.