Procedure to file for divorce & claim alimony

 my cousin, get married a person 17 years back. 25K dowry paid at the time of marriage.His parents hide the truth that he may not be fit do sex and produce children. From last 17 years my cousin living with him and his parents in same house and falsely victimized and asked to under go various test. In this process she has been victim of psychological torture and physical abuse. My cousin father & brother are alcoholic addicts and don't have any proper income so they are not in a position to support her. She want to divorce & get alimony so that she start again peacefully. She is just 10th pass out. Her husband don’t have job from last 14 years and no any property on his name. But his parent are well recognized in society and having nearly 2 crore property. His father is a retired doctor and mother is a writer. By considering this back ground how my cousin can file a case for divorce and alimony, how much alimony she can ask.