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If the house was included in the Bankruptcy - which means he is no longer liable to the mortgage company - why does your son want to unload the house?
If he cannot afford to continue to pay the mortgage, he can just allow the mortgage company to foreclose on the house. Since the house was included in the Bankruptcy, and if he is able to get a hardship discharge (or convert the case to a Chapter 7 if he cannot get the hardship discharge), allowing the house to foreclose will have no negative impact on his credit score, and the mortgage company cannot get a deficiency judgment for the balance of the mortgage.
He can even continue to live in the home - even if he is no longer paying the mortgage - until the house finally sells at a foreclosure auction. (There are many who are still in their homes for years after not having paid the mortgage.)
I hope this has helped you. If not, please let me know.