Should I let my son give his money to me?

My son is 17 years old and is the middle child out of 6 kids. His older siblings are grown and gone but I have two younger ones living with me. My son does not live with me either. It was a bit of debacle we had last year. He was sexually active, I punished him for the disobedience because I don't allow sex under 18, he kept doing it, I made him move out. He's doing good in his little apartment with his girlfriend's help every now and then (Shes much much much older than him and I disapprove. Shes 20.) My husband works in another state and doesn't even make enough. He works 12 hours at a tire place and I am a nurse. So much stuff has been going on for me financially. I've been having issues with the IRS, I've been struggling to pay bills, and of course my kids need stuff from me. I have been beyond depressed and I actually broke down in tears the other day. My son overheard me when he came to visit. He sort of just held me and offered to help. I told him that it's not his job and that if he wants to help, he can start buying food for his siblings at least. He told me he recently submitted a poem into this contest and made it into the finals (No joke, my son is a writer.) If he wins then he gets $2000. He told me he doesn't think he will win but if he does, he will give all of the money to me. My son just told me earlier that he has picked up another job to help support me. I appreciate how optimistic he is but I just can't depend on him hoping to win something that so many people are probably competing in or yet another job. However, if he wants to help then I'm absolutely not going to stop him because I do need more support. I just feel guilty over it and I want to know anyone's opinions.