The property from mother's sife is not ancestral.
The property of deceased Hindu male devolves equally upon his ClassI legal heirs i.e. Mother (if alive as on date of death), wife (if alive as on date of death), sons,daughters...........
In the absence of a valid WILL it is simple matter of inheritance; Intestate Succession.
The forms/procedures are available at website/office of authortiy under whose jurisdicton property falls.
Death certificate,legal heir certificate (affidavit as per local precedences) are basic requirements.
Submit completed forms with requisite docs to concerend office/official say; Patwari and obtain copy of updated mutation records...