How to get my share in father's or ancestral property

My father loves me a lot and had some ancestral property , one house on his name, and two plots. He died of cardiac arrest nearly 11 years ago and doesn't write any vill. I started doing job after his death and living with my mother and sisters in our house. I paid 80% of my fees from my own earnings during this time and did masters in technology. But from last five years my family is again and again building pressure and harassing me. Whenever I joined job during this time. They again and again handover their family matters to me. Now I am totally exhausted and do some good job with keeping myself at first. But my mother is 72 years old and considers if I live with this attitude then she will not allow me to live together and wants me to left home. Many of my family members are in police service and several of them are lawyers. So I didn't find any way to complain against them. I mostly completed my doctorate I technical field. I only want that how can I get some share in my family property. So at least I can survive in this world. Any suggestions from your side. Where should I start. I am not able to approach court because maximum of them are their knowns.