Harassment by sister in law can I take against her

Hi Sir/Madam, I am married for 1 and half years now, my sister in laws come home daily to look after their parents and fill my mother in laws mind all ill things about me.When this was told to my husband he's not bothered about it and worried about his parents and that his sisters would not come to home if asked about all this. They're always keeping a tab on me, watching my every move. It's very disgusting and i am not happy with their activities and they also tell ill things about me to relative who visit. It's really bothering me a lot, it's like put in a cage. They find faults in everything i do. But i don't have any issue with my husband, we're happy with each other and he cares for me. please guide me what to do...i am really losing my peace of mind thinking of these things and not able to take correct decision on what to be done to stop all this.