Restraing my sister in law, her husband and her father in law

I need help for legal proceedings, as my case is mix of family law and property law too. I am 30 years mother of 2 girls. One is 14 months and other is 3 years old. My alliance was fixed 4 years back by my sister in law (my husband's younger sister),her then fiancee now husband and her father-in-law in hurry as her marriage was fixed already and she wanted her brother married before her marriage. We were literally manipulated by them to get married early. Since begining they were always interfering because they had got us married. Even though me and my husband are quite elder to them. My husband and his sister are the only famiy, as they lost their parents and elder brother few months before my marriage. My husband had gone in shock and never took much interest in financial issues and property matters. My sister-in-law and her then fiancee and now husband had always kept everything under their control. Recently a month back I learnt that the house we are living in was passed down to my husband as his late father always wanted sons to have it but never made a will and the daughter was given different property in the city. But my sister in law and his husband got the property registered in my sister in laws name and my husband's name by telling him that laws have changed and sister name should be there too. And also that she took away all the gold and cash too without giving anything to my husband immediately after her marriage. When I made my husband realize what they're doing to my marriage and our lives, my sister in law came to our home cried in front of my husband and said I am creating a rift between them. I am separating brother sister. Now my issue is that my husband wanted to develop the house we are living in as the roof is not strong. He went  to talk to his sister at her in laws house. There they all spoke badly to him, even his own sister and they all physically abused my husband and threatened him saying they can put litigations on our house if I don't apologize on a bond paper for making my husband realize their wrongdoings. I have been quite all these years thinking she will change but she and her husband have become much more manipulative now. And now its coming down on my kids too. At this point we are totally broken, as no one in family are helping us and my husband is already going through a emotional breakdown and has lost his job too. He is totally schocked that his sister and her in laws are doing this to us. Please help us with right advice and path now as what should be done.