Refer the rbi notification https://m.rbi.org.in//scripts/NotificationUser.aspx?Id=2284&Mode=0
If the bank is not satisfied in that case the succession certificate from court has to be provided.
To obtain succession certificate, a petition to the District Judge within whose jurisdiction the deceased person ordinarily resided at the time of his or her death or, if at that time he or she had no fixed place of residence, the District Judge within whose jurisdiction any part of the property of the deceased may be found.
Petition for Certificate
A petition for succession certificate must contain the following particulars:
Time of death of the deceased;
Residence or details of properties of the deceased at the time of death within which Judge the jurisdiction falls under;
Details of family or other near relatives;
The rights of the petitioner;
Absence of any impediment to the grant of certificate;
Grant of Certificate
On making the petition, if the District Judge is satisfied as to the ground of making the petition, can grant an opportunity of hearing to persons who, in his/her opinion, should be heard. After hearing all parties, the Judge can decide the right of the petitioner to be granted the succession certificate. The Judge would then pass an order for grant of certificate specifying the debts and securities set forth in the application empowering the person to receive interest or dividend or to negotiate or transfer or do both.