Am I or my mother liable to pay father's debts after his death

Hi ...I require a legal advise please. My father has died 3 years back and before his death he had taken a personal loan with a bank and this loan was taken at least 5 years before his death which he was not able to pay. Now, my question is whether there is any legal implication on Me or my mother to repay the loan that my father took from the bank. And, if any banks representative/collection agent from the bank tries to humiliate me or my mother by saying any inappropriate words or threaten my family members can i take a legal action against them for mental harassment.