Obtain the legal heir certificate from the requisite/concerned District Tehasildar office. Submit an application with you family details and death certificate of your father.
You will have to apply to the Tehsildar of the Taluka within which the deceased last permanently resided.
Documents required to obtain this would include:-
a. death certificate of father.
b. ration card or extracts of family register disclosing the family tree.
c. aadhar of all the legal heirs.
you will be required to pay a nominal fee to obtain this certificate.