What Sister has to do when her father died for fathers property?

Hello Expert. I am writing to you on behalf of my cousin sister, who is 41 yrs, unmarried, staying with her father, and 1 elder and 1 younger brother, both married,and having good jobs. Father died few days back, was retired from 15 years. he was suffering from kidney failure, and was on dialysis. Both brother was not giving any money for fathers medical, both were taking money from father himself, for his medical. After fathers death, both brother are fighting for property as THERE IS NOT WILL. Elder brother stay away, in fathers purchased house, but given to ELDER brother. FATHER & Sister was staying with fathers owned house, along with young son and his wife and 1 grand child. Both Father & Sister was not given food, so they have to starve, or have to use his small saving for survival. Now father is no more, what My Sister has to do, as younger Brother's wife is giving threatening her and even she bet her, and ask her to leave and go away, she will not get any property. Please help and advise what she has to do to get share in fathers property. She do not have money and qualification to debate, We, cousins, are taking some care of her, but she is feeling awkward, to stay with us. kindly suggest what is to be done