Oh Im so glad you didnt have the agonizing years long wait like I had to go through! It took me almost 3 years to get approved...sigh.
Ok, I am Corys representative Payee. What you have to do is get yourself a little ledger book from walmart...and a receipt book is a good idea too for when you give him any cash spending money.
Im assuming his money is going into some sort of joint checking or savings account in both your names. Or just your name...whichever.
Now, you can take all your monthly bills and divide by how many people live there and he is basically responsible for his fair share. Or you can just charge him a fair and reasonable rent for room and board to pay for him living and eating in your home. Keep track of this in your ledger book!
Next if you buy him any clothing, books, recreational items, shoes, etc...get receipts and mark them in the ledger book. Or you can just keep the checks if they are in the checking account and you can keep the statements instead of receipts but mark in the ledger each month.
If you give him cash for incidentals and going out to eat, gas, etc...have him sign a receipt book.
Keep track of the money.
Someplace down the line they will send you a report asking you how you spent the money...you tell them how much went for room and board, how much for clothing, how much you saved. Taa daa.
Its really not all that hard.
For example....Cory gets about 500 because he has an overpayment and some wages. He pays me 250 for rent, we spend the rest on clothing, gas, and baby stuff.