I think it usually depends on the boy's decision whether to tell his right or not to lie but it is better to tell the truth because he is following religious lines. Even though he won $46k from sports betting, it's a really big amount his parents probably won't say anything about. Following his parents' orders, he can spend the money on other activities that will bring good things in his life. He can increase its value by doing business or investment. If he does good things, his parents will be happy. If he makes a wrong decision alone, he can suffer. It is expected that parents can guide him to the right decision.