Fraud in marriage as husband didn't disclose about his debts before marriage.

My sister has gotten arranged married to a man who lied to her about financial condition. Before marriage the boy only told about his 9lac job and a house worth of 1 crore . After one year of marriage she on her own got to know that her husband's family has hidden about Debts of 1.2 crore hand loans with 2.5% monthly interest. At first Somehow The boys family could cleverly managed for a 5 months that all debts happened only after marriage. But my sister started enquiring about for what reason they bought debts in such huge amount . By this time The boy started saying that the debts happened before marriage and she agreed to marry him even after knowing that. By this allegation she knew that she was victim of fraud marriage. Then her husband asked for registration of land purchased by her. Her mother in law insisted her to wash clothes with her hands to save electricity, even after working in TCS for 10 hours a day . And many more problems... Her husband is asking for her salary.. Now his behaviour is like she should earn, save, plan for a kid, don't leave the job for her serious back pain and accept him as it is. He left his job with in 5 months of marriage. Earn 20 k per month as freelancer. The girl earns 50 k month in f What can be done legally? How to proceed? How to protect her? Please suggest valuable info.