Undivided Hindu Ancestral Property

The Ancestral Property which was undivided, and in the name of my Grandfather as per govt records. The Property was effected under ULC Act when grandfather was alive, and the same was taken over by the Government as surplus land, later my Father's 3elder brother's being the Head of the family, they have applied for assumption of the same surplus land and was exempted on their names, now my father's 3elder brothers are denying my fathers share as the proceedings were passed on those 3elder brothers name's, So my question is that does the exempted land on their names is liable to be divided or not, as it is an Undivided Ancestral Property.