Ancestor Property sharing fraud took signature by emotional blackmail

My Mother in law had her parents property in Miraj Maharastra. She had 4 elder brothers and 2 Younger sisters Last month she went to Maharastra for talks and they forced blackmailed emotionally and took signature. She was not allowed to contact her children and took the signature. She came back to Bangalore. Later within a week she filed a case since they took the signature forcibly. They informed that Property would be divided only between Sons and not with Daughters. We have filed a case will we be able to get some share in the property. I mean her three children or my mother in law herself.