1) Legal Heir Certificate is only issued from revenue office of the district to identify a particular deceased persons living heirs
2) This certificate is issued for a limited purpose of receiving Government dues such as Govt. Provident Fund, Gratuity etc. to the legal heir of the deceased employee of the State and Central Govt.
3) A Legal Heirship Certificate is issued by a tahsildar.
A tahsildar has no right to decide on disputed issues of title or succession. Prior to the issuance of the Legal Heirship Certificate, a summary enquiry is undertaken by the tahsildar, through his or her functionaries, to ascertain the legal heirs of the deceased, so far as may be possible.
A certificate is issued on the basis thereof.
4) you should through your advocate take the plea that your father was permanently residing in bhubaneswar and has PAN Card , election card , aaddhar card issued in BHubnaeshwar . and hence LHC should be issued from Bhubaneshwar
5) it is better you make an application for issue of letters of administration from court since your father died intestate and then make application for mutation of property in your mother name