How to make harassing son and daughter in law vacate the house?

My father and mother owns a property of 1800 sq ft. 800 sq ft registered in my father's name and 1000 sq ft registered on my mother's name. I have 2 brother and one sister. I took personal loan and built a house on it. My father passed away recently. My brother and his wife were harassing my mother. We all gathered in our family and asked them to vacate the house. One of my younger brother works abroad. My mother went to his house for a month. In the mean time, my brother who harassed my mother prepared a duplicate key and entered the house without my mother's consent when she was abroad. He is speaking in abusive language to all our family members. We dont know what to do. I would like to know how can my brother be evicted from our house. Also, how to stop him from harassing my mother or our family