Ancestral property Advise needed on the daughter claims

Hello, My Nanaji has 8 kids(4 boys + 4 girls) including my mother, he didn't do any will, though one of my mama claims to have one making him the owner of the property. There is a case in court which got dismissed by a judge in the lower court. My question is now there is the name of all his kids in the property. The deal is been worked to sell the property he says they are not going to give any share to the sisters. My question is it possible for them to sell the property without taking a signature from all the parties register as part of owners of the party. Is there are any legal option for my mother? to pursue in this situation if she don't get her rights.