Signature of granddaughter is mandatory for partition of the property

Sir my mother grandfather has died. past 10 years ago. My mother grandfather has two daughter and 3 sons. My mothers grandfather has 1 acre agriculture land. My mothers grandfather get 1 acre from his father separately. Now family members are planning to split the 1 acre land into 5 split up for my mothers- mother and another four members. My question is My mother is eldest granddaughter for her grandfather. Whether signature of my mother is compulsary for their documentation. And whether they can make split up without my mother(Eldest Granddaughter) signature.