Divorcee sister in law troubling

I am 29 years old and married. I had love marriage. My husband love me very much and so i.. my problems are mentioned below - 1. I have a divorcee sister in law (sil) staying with us with her 2kids. She had 2 unsuccessful marriage. 2. She came back to her home just after our engagement so we couldn't stopped her . 3. We don't have land and stay in rental house . My husband has 2more elder brothers who live seperately and don't give any financial help to us. My husband is taking care of his sister , her 2kids and his mother and father. My husband is not so financially strong and whatever he earn he spend in them. Their list of shopping never ends. They eat so much and he had to even take care of the kids and their schooling. 4. We before marriage thought of buying land making house . But how can we? 5. Moreover my sil us jealous of me and many times told lie about me to my husband and told him not to tell me. 6. I supported her very much but she just used me. When i had an operation my mil and sil didn't took care of me instead told me to wash my clothes and make my food. 7. My husband is aware of all these but he don't take any step . I insisted him if marrying off his sister but he feels bad for her to say it. Please help me i m getting depressed day by day and sometimes feel of leaving him or ending my life