The ruling on marrying off a son who fears falling into sin

Question:
I have a son who is fifteen years old. For some time now, he has been talking to us about marriage and has asked us to marry him off. We did not take his words seriously, but he said, "If you want to save me from disgrace, marry me off, for it will keep me away from many things that you know." Please note that he has three older brothers who are not married, and our financial situation is moderate. Are we obligated to marry him off?

Answer:
If you fear for him that he will fall into... ah... fornication, and his brothers are not like him—meaning nothing has happened to them that would cause fear for themselves—then you should marry him off. But if they are all in a state of fear for themselves, then you should start with the eldest, then the next eldest. If you have the means, marry them all off; that is better. As for when you are in straitened circumstances and cannot afford it, you should marry them off one by one, starting with the eldest, then the next eldest. Yes.