Even if it is a family transaction I highly recommend each of you use your own attorney. You do not need to use a broker. You both need to agree upon price and put it in writing and both sign off on it.
One other suggestion: Check with your accountant to make sure that the transaction is structured to minimize taxes.
Hope that helps.
Quit claim to save the transfer tax fees and closing costs. You son can get a loan and you can pay off your loan with the proceeds. You do need a lawyer to make sure both of you are protected and transfer is done property and you are cleared of all liability, and your son had full ownership.