Equal share of agricultural land to the daughter

Hello, My father lived in the state of karnataka and had an agricultural land there. He had 3 children in which elder 1 son and younger 2 are daughters. He did not do any partition or distribution of property to his children. He died on 5th of June, 2015. My mother is living alone in this place. Iam their third child and was born on 1st of june,1971 and was married off on 23rd may 1994. My father had an agricultural land that he got from his father(i.e ancestral property). The agricultural land that my grand father inherited was of approximate 10 acres I claimed an equal share in the whole property of 10 acres. Is there any chance that I will get my equal share? and if so then what should be the documents or laws that we should use for the argument? And now my brother is threatening to kill me.what should I do for this? Please note: 1) The land was not distributed to any of his children before his death and there are no legal documents proving the same. 2)some other names has joined this RTC.(i.e grand father and his brother &sons, father's brother and his sons) Please mention the acts and laws that would be helpful in this case. Thank you