If we understand your question properly, you short sold the house to some unrelated person or third party. If so, then so long as the transaction was an "arms length" one with no collusion between you and the buyer, then you--and your short sale--have nothing to do with any subsequent sale by the person who bought from you, and he can sell to anyone he wants, including your son. You have no liability or risk for what an independent person does.
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