Filing itr after death

My wife expired in May 2021.So I filed ITR on his behalf as per her desire few days after. Return has been accepted and 143(1) notice received. Demand made was deposited. Now AIS has come. Now Return has to be revised to some extent. Now point is, can file revised return? Her saving bank account is joint with me. Her money stands transfered to her son and daughter in USA. I hardly need single paisa from it. Advise..