Transfer of property

My grandfather purchased land in manglore. Grandmother also passed away few years back. They have 4childrens. My dad was their son who passed away in the year 2008 and my mom died in the year 2015. Recently i came to know that my uncles(dad's brothers) have mutated only their names in the 7/12 extract, without informing us i.e. me and my sister who are the legal heirs of my dad. My question is do i and my sister have right in the mentioned property of my grandfather as we are the legal heir of my dad? and we both are married. Can we apply for transfer of shares of property in our names? If yes than what to apply for legal heir certificate or succession certificate and where manglore where the property is situated or mumbai where he died? What all the documents will i need for applying for certificate? And what is the procedure for partition after that? And is there any limitation period for applying for rights over the property? Kindly reply as iam in urgent need to knowing the procedure before I proceed. Thanks in advance