In a decree for recovery passed against your father by a court of law and if the decree holder makes a list of defendant's assets whether still available on his name or devolving on his legal heirs upon his intestate death, the decree holder may lay a claim for recovery of the amount due from the assets of the judgment debtor. Therefore if the legal heirs are availing the benefits/assets of the deceased judgment debtor they are liable to repay the debts of the deceased to the extent they have availed the assets.
As per the rules, PPF enjoys the protection of credit balance from attachment – “Amount standing to the credit of any account holder shall not be liable to attachment under any order or decree of any the court in respect of any debt or liability incurred by the account holder.”
However once the amount has been withdrawn from the PF account and has been held either by the PPF account holder in his bank account or by the legal heirs of the deceased judgment debtor, it becomes the individual amount belonging to the deceased judgment debtor and whosoever is availing the benefit of this assets are liable to repay the debts of the deceased judgment debtor proportionately to the extent of the benefits they actually received/availed.