Domestic violence mental and physical harrassment.

It's been 3 years of my marriage now. I have humiliated insulted and even got beaten up from my sister in laws in the name of dowry. One of the sister in law resides here in my home bt earlier when I got married I was unaware of this fact that she shall live with me...and this choas was not getting over my another sister in law came here to reside on my home...things were getting worsen because they both gang up and use to instigate my husband so much that he ends everything by hitting, torturing, harassing me mentally and physically both.I have A10 month old baby boy they take away the baby from me and they threats me to kill him....if I want my baby back then they want me to leave my husband and the home as it belongs to my father in law....now it's not getting over here my another that's means 3rd numbered sister in law is here in my home more than 2 months and she is not going to her in laws home yesterday with a very small despite all three of them with my husband charged me all at once I was helpless...I got beaten up badly with my baby on one arm and was struggling to have shelter from them but didn't worked....they are just a black dot in the name of humanity.....what shall I do will I get any kind of justice if I file case against them as they say it's their father's home they can be here to their wish and nobody do anything to them.