Property purchased in mother's name how to distribute the property

My father purchased a plot in the name of his mother, i.e my grandmother, who died in the year 2011. & my grandfather expired many years back before my birth, i.e, 1991(I Could't remember the date of his expiry). Recently, in the year 2014, i lost my father. Now my mother is on the verge of partitioning the property that my father owned in the name of my grandmather. I have two paternal uncles & two paternal aunt's. Now since the land is going to be partition both all of them wants a piece out of it. Will my paternal aunt's get a piece of the land? & are their signatures essential?