Which personal law applies in your case?
Or are you all Hindu?
The said property is agricultural land, rural, Urban, or it is a building?
The property is in which state?
The proeprty in the hands of your paternal gandfather was self earned/acquired or ancestral?
Your paternal gandfather has gifted below or equal to more than his clear share in property?
The said gift to your mother is by registered gift deed?
Your mother has updated in mutations records?