Property issue

My husband and his brother co own a property in greater kailash2, New Delhi The house has been occupied by my daughter for the last four years with all electricity bill cable bill and WiFi bill payments being done by her I was getting paint work done and suddenly my husbands sister and her husband barged in saying that they have the rights to the property and that they are the owner of the property and forcefully entered the house I dialler 112 and sought police help and filed a complaint in the police station She has all the duplicate keys of the house which I don’t know when she got them made She tried to break a lock last night in my absence for which I reported to the police I live in Shimla and my daughter is also not here these days due to lockdown rules My query: 1) Can she enter forcefully and take possession keeping in mind that the property is undivided and we are not aware that the brother’s ownership rights have been transferred in her name 2) what is the safety and security of my house . it’s fully furnished with all modern furniture and gadgets 3) what steps should I take so that she doesn’t enter and steal like she did some ten days ago