As rightly observed by expert lawyers in this thread, the Nominee to a bank account is just a trustee to receive the amount on behalf of the legal heirs/successors in interest and distribute the same equally among all the successors.
If the mother of deceased is not alive and presuming the deceased belonged to Hindu religion, the properties left behind by him upon his intestate death shall devolve upon his class II legal heirs.
The list of class II legal heirs is given below:
If there are no heirs in Class I, the property will given to the heirs within Class II. They are divided into nine categories. The rule is that an heir in an earlier category excludes heirs in later category. Further all heirs in one category take simultaneously per capita share. They are as follows:
1] Category I -
a) Father.
2] Category II -
a) Son’s daughter’s son.
b) Son’s daughter’s daughter.
c) Brother.
d) Sister.
3] Category III -
a) Daughter’s son’s son.
b) Daughter’s son’s daughter.
c) Daughter’s daughter’s son.
d) Daughter’s daughter’s daughter.
4] Category IV -
a) Brother’s son.
b) Brother’s daughter.
c) Sister’s son.
d) Sister’s daughter.
5] Category V -
a) Father’s father.
b) Father’s mother.
6] Category VI -
a) Father’s widow. [Step mother].
b) Brother’s widow.
7] Category VII -
a) Father’s brother.
b) Father’s sister.
8] Category VIII -
a) Mother’s father.
b) Mother’s mother.
9] Category IX –
a) Mother’s brother.
b) Mother’s sister.
The rule of share in Class-II heirs is that each will take per capita including widow.
The revenue department will not issue legal heirship certificate for class II legal heirs, hence you may either have to approach court with a petition for nonsuccessive certificate or to declare the class II Legal heirs as per the affidavit to be submitted before court in this regard.