Do daughters have rights if father transfers property to second wife?

My father received land from his father and later inherited a big portion from his sister (phuppho) before her death. He reportedly got it by emotionally manipulating her. He has now secretly married another woman and has a son and daughter with her. We are three daughters from his first wife, and we have been living in this house with our mother since childhood. The second wife and her children have never lived here. Now, he is planning to either sell the land or transfer everything to his second wife and her children. He said he will only give us the land he received from his father, but the big portion from his sister he intends to sell or give to his second wife. Could you please advise: Do we daughters have any legal claim to this land? Can he sell or transfer it all without our consent, both before and after his death? Does our long-term residence here affect our rights?