The boy is the only child of the widower and does not seem to be interested in the same line of business and even when he does, he requires more maturity to be able to manage the business such as graduating from the college, etc.
If he's doing fine then just let his maturing age come to him for him to realize how tough life is and that's going to help him decide, what's best for him to do with that kind of money. But I'm afraid that some bad influence might come to him because at that age, it's all about partying if he is not financially knowledgeable and he might just spend that money on nonsense things. But IMHO, that's the best that he can do for now, to keep it and don't spend all of it at once.