How can someone guarantee a debt without the borrower knowing about it or giving authorization to the bank to release information concerning the credit to a third a party?
The post indicated that the kids will not know that dad is guaranteeing the loan. As for as the kids know the transaction is between them and the bank. In that case the bank has no grounds or authority to release any information to the dad, whether he "ghost guarantees" the loan or not. The bank must follow the privacy guidelines pertaining to the kids application and transactions.
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The opinions expressed are mine and they are not to be taken as legal advice.