Sister in law and mother in law

We are 4 in the family. Me, husband, mother in law and unmarred sister in law. My mother in law is too stingy. From day one of my marriage I contribute my entire salary to households. Even my husband will give his salary to the family. Mother in law is criminal minded, with out even informing me along with her daughter they bought a flat, they will buy gold of their choice. Even I contribute to family, apart from regular fightings b/w me ,my parents with her, she also fought with my husband and made him sign on an empty bond with her mental torture, she scold me my parents all third degree words. Now am pregnant, she don't like us to have this kid. As it's an expense again. It's a own house we reside, now she will sell the house for his daughter wedding. And take the remaining money with her. Now, she is filling my husband mind that I have external affairs and forcing him to divorce me. As he didn't agree, she is showing hell with her mental torture. As her daughter is a lady of the family, the entire family of her says, she will not contribute to the family. Is it legal that a unmarried woman should not contribute to family when brother n his wife working. What action I can possibly take against my mother in law. Please help.