You are the owner of this flat hence, your sister in law cannot force you to vacate the house. Your sister in law is living with you in your home. You can send a legal notice for eviction from your home. If she does not follow the notice you should lodge a complaint for criminal trespass and criminal intimidation.
You should seek a protection order from the Judicial Magistrate under the Domestic Violence Act. If your husband is a co-owner then you should lodge a complaint under Section 12 for domestic violence from your in-laws. You can seek a protection order thereby restricting your sister in law to enter a portion of your house where you are living.
You are an owner of this house hence, you cannot seek residence order and alternative accommodation under the Domestic Violence Act. If your husband is a co-owner in this house, you still have the right to evict your sister in law from this home.
Tounting and mental torture because the birth of a second girl child is an act of violence. This kind of act constitutes mental and psychological abuses as defined in the Domestic Violence Act.
Lodge a Complaint
You should contact a protection officer of your city and lodge a complaint under Section 12 of the Domestic Violence Act. Your sister in law without any right forcing you to vacate your house. If you have no information about the name of the protection officer you should file a complaint in the Mahila Thana of your city. The SHO of the Mahila Thana will transfer your case to the Protection Officer (PO).
The PO will investigate your case and prepare a report. He will submit that report to the Judicial Magistrate of First Class for taking cognisance. When the Magistrate takes cognizance he will issue a summons to your sister in law to appear in the court. If the Magistrate satisfies from the facts that the act of domestic violence has been committed then he can pass any suitable order to protect you from such an incident.