The property in your grand mother's name is her absolute property vide section 14 of hindu succession act. Since the property is showing her name in 1947 and she is alive as of date, she is the owner, your father must have taken a loan on the property and then repaid it
So it appears that somewhere years ago, the property was not mutuated in the mandal records in the name of your grand mother( typically after the will is accepted by the legal heirs, the legal heirs must have updated MRO records and then your grand mother's name must have been updated in records).
So basically, If your grand mother is alive, then you cannot do partition. you can only ask her to execute a gift deed or will of her properties in favour of her legal heirs in a manner desired by you . none of the children can claim partition as long as she is alive as it is her absolute property now in eyes of law.