Does grand daughter has any rights on her grandfather's properties

Dear sir, I would like to underlined following few points My self Lalita BM from Shimoga Karnataka district My grandfather has 7 properties including sites,houses and commercial buildings We are 5 grandsons (including me), 3 girls and 2 boys, all are married. Now my father and grandfather are no more, my father died around 30 years back and my mother is still alive. But unfortunately 3 days back means (14-09-2017) My brothers came to our house without intimation and took a signature of all 3 sisters on e- stamp paper for the settlement of 13.5 lakh , however I am not ready for the agreement , as that was done forcebly and emotionally , they given 5lakh as advance forcebly we didn't demand and not yet touched the money but I demanded for at least min to min 20 lakhs Rs for me as out of 7 properties which are near by 4 crores values . But we are not bother or don't worry about for other my sisters on how much they are agreeing and satisfy Now they are selling one properties to local