Grandfather not willing to give property to my mother

My grandfather has 5 daughters (no sons) and my mother is the eldest one. She has two daughters. Myself 23 years old and my sister(16 years). My father does agriculture . Due to family disputes my grandfather didnt keep any contact with us from last 9 years and he didnt informed us about any family related functions and removed my morher's name in all invitations . My mother went into dipression. So I went to my grandfather house to talk to him and also share my happiness as I hot job . But they beat me and insulted me and said that we will not give any of their property to my mother. I filed case against them for beating me. My grandfather is forcing us to take back the complaint otherwise he wont give any property to my mother. Please help us , is it possible that my mother cannot get the share in property . If so please help us how we can deal with this situation. Recently he even registered few property in the name of other 4 sisters as a gift. My mother is very much worried about our future. Please help us.