1. Your deceased father had stood guarantor for he loan taken by thye borrower who submitted fake documents,
2. Guarantors are not appointed, people stand as guarantor the way your deceased father did,
3.After the demise of the guarantor, his legal heirs are liable to pay for the amount your deceased father stood guanrantor for,
4. The legal heirs liability to discharge the guarantee is limited to the amount of the guarantee or the amount inherited by the legal heirs of the eceased guarantor, whichever is less,
5. Since the legal heirs did not inherit any property from the deceased guarantor, they are free from any liability on this unpaid loan account,
6. So, relax.