Shall I stop all the benefits from Ancestors property who's getting from it

Hello Sir/Madam, My father has two wives, my mother is first wife and step-mother also there with my father. we are 3 children 2 men and 1 women already married, step mother has 2 sons, one married and another one yet to married. The issue is my father completely with them only always and taking complete income from lands. my grand father purchased 2.20 Acres land from other relatives which is adjacent to land 20 to 25 years back. And 15 years back my father sold out 1.20 Acres to others and he purchased 2.20 Acres from same seller one who sold their 2.20 Acres before to my grand father, for that my father given complete land of 25Acres to others for farming, got the money and paid to seller for 2.20 Acres. Total 5 Acres land he given some amount to seller and registered to step-mother. we came to know that after 1 year with someone outside of family, my brother and myself asked to my father why you did like that, he said that already I have land in my name because of that only registered to your step-mother's name. we are asking from 15 years, he is playing games with me and my brother, even in my village elders said that you will get land why people are worrying about it. Later he is saying that she(step-mother) only purchased, you people don't have rights to ask about it. We went to the mandal market chairmen and village sarpanch and elders so many times. my father is always saying that I will give land to you after my death only but not that land. What should I do, shall I proceed legally to stop all the benefits from complete land or should I contact any settlement people to do this. I am 38 years old with 3 kids and doing a private job, my brother having one kid and doing private job. sister married. Please suggest me for better way.