Mutation Record

Hi, We have a family property in Udupi, Karnataka which belong to the Grandmother(Narsi) of my mother. She had 9 kids(all have passed away except Shridhar) of which one is my Grandmother(Sushila - also passed away). As of date, the property is in name of grandkids of one of my Grandmother's sister's(Naagi) Grandchildren. I pulled the record through the RTC portal of Karnataka Government for the year [deleted] and found the name Naagi on it. However, the records for the year [deleted] show the names of Naagi's kids and the recent record shows the names of her grandkids. There is no record online before the year 2001. All we need is our Grandmothers share of the property as she is also an legal heir. Also, they have sold some 5 acres of the total 17.5 acres property to somebody else. Please let us know if it is possible or us to legally get hold of our share or divide the total property between the nine kids. Also, let us know how to go about it as I am unable find any mutation certificate which shows the transfer of name from Narsi to Naagi