Loan closure & property documents

My friends brother passed away suddenly last with out leaving behind a will for his property now the problem is that the WIFE & MOTHER cant trace the property documents reason being he had taken a bank loan according to the information that they have is that the loan had been cleared before his death the Question here is how do they get information of the loan closure & if the bank is still in possession of the property documents what do they need to do to get this information PLEASE ADVISE