After selling the land property, the amount was not equally shared among the family people

It is stated that me and my family are resident of jabalpur (MP) and there was a land in the name of my mother in purulia (WB). The land was sold by my mother and at that time my middle sister was also there with her. Due to my mother's physical illness my sister helped in all the necessary steps required in selling. The land was sold in approx amount of 23 lakhs. And my mother died after few months due to physical illness The members in my family includes my mother,father, my eldest sister,middle sister and me The amount that my middle sister has transferred in my account was 6 lakhs and she din't transferred anything to my eldest sister account saying that already father has spent alot in her marriage Now my question is ideally the money should have been divided in 4 equal parts which will come around and should have been distributed equally, but since this din't happened please suggest what we can do in this regard. My middle sister has intention to keep full 17 lakhs with her as my father is also not physically well and he can not intervene much in that because of this reason. She has also kept mother's jwellery with her and not included us in the share. She physically harass my father and beats him often . Please suggest how we should proceed with legal actions