Query relating to ITR 1 Filling As A Legal heir Of A Deceased Assesse

My father has died . He was a pensioner and candidate of ITR 1 form . He was eligible for refund . I have created an e filling account in the name of my mother and created a new bank account in her name and registered her as a representative assesse  with that new bank account . My question is when I am opening portal of my father as a legal representative , I am not finding that new bank account created in my mothers name in the personal information of my father while doing e filling of my father . The confusion is in which account i will get my refund ?Wheather it will come in my fathers account or new account created in my mothers name ? And also the validation process of e filling of my father . Wheather the ITR will be validated through bank account of my father or new bank account created in the name of my mother ? What if I closed all the bank account of my father before filling my fathers ITR . I am daamm confused . Please help me .