Agricultural land

Before giving any opinion one has to go through the documents in detail.  But, according to your details given above, I am giving the opinion. By your name I can understand that you are Hindu by religion.  As you said that your grandmother had inherited the property through your great grand mother.  Since the patta pass books and revenue records reflect the name of your grand mother, it will become her own self acquired property, since your grand mother is female.  I assume that your great grand mother has registered the property in the name of your grand mother.  If you enquire in the MRO office or collector office, you will be knowing that how the property came to the name of your grand mother.  In the above circumtances, your grand mother's sister and brother cannot claim the property as it is not ancestral in the hands of your grand mother.  Though it is ancestral property, but it has fallen in the hands of your grand mother, it will cease the nature of ancestral, in the case of female.  In the case of male the position will be reverse. 

Thanks for your reply, I will emphasise on the below points 1. It's an ancestral property my great grandmother got this property from her mother. 2. I understand from my grandparents that this land was passed on to my grandmother as (paspu kumkum) by word of mouth initially...later on inherited by a law passed in AP in 60's wherein the person who was doing cultivation was given the right to the property (if applicable) and at that time my great grandmother has signed in a letter and with that as a proof all the documents were been changed automatically to my grandmother name by the MRO, they came to our home to do this it seems.. 3. However the name on the register in the mandalam office is with my great grandmother name and all the other documents are with my grandmother name.. Please suggest