Partition of my grandfather property , percentage of mine

My grandfather have a house which is gifted by his brother's. After my grandfather died my father and his one of the brother ( total 10 brother ) is living in house from 30 years. Now all decided to sell that house and divide among them. Now my father also wanted to leave my mother and me sister. So now how much percentage of my father's share will come to me and my sis as it is my grandfather property and he did not wrote will.