The house belongs to the son and has nothing to do with the father's debt. Creditors can't take this property as their father's property to claim debts.

However, the law also stipulates that the debtor's malicious transfer of property and expenditure of funds during the debt repayment period is invalid. If the beneficiary does not belong to a bona fide third party, the creditor has the right to cancel and can sue to cancel such behavior of the debtor.

Because you are the son of the debtor, once it is determined that your father's behavior constitutes malicious expenditure to avoid debt, it is more likely to be malicious collusion in law.

In that case, either you spit out the down payment, or the other party can ask the auction house to get the down payment. But he can only claim rights within the scope of down payment. If the other party can't prove that your father maliciously evaded the debt, you can't claim.