Divorce from wife

My brother has been married for last 10 years and has a son of 8 years. His marriage has always been very troublesome where my bhabi has been very abusive and disrespectful towards my brother and my entire family. All through my brother had stayed separately from our family with his wife to avoid quarrels. But now two years back he got transferred to a new location. my Babu was initially not ready to shift and tildy brother to shift alone. However my brother convinced her and took her and his son to the new location. After few months when they all came for vacation back to hometown my bhabi went to stay at her maternal house rather staying with us. And she also dint go back with my brother. He had to eventually cancell all their tickets. My family went to speak to her and her parents who showed no interest in sending her back. We kept following up with them but of no reply. Later we came to know she has shifted to different places with her son and she doesn't want to go back and kept giving false allegations on my brother. Now it's two years and my brother after giving lot of attempts have decided to end the marriage. But my bhabi neither speaks to him or meets him or even answers his call or our call. My brother wants to have a peaceful life but we are clueless on our standing and how to go forward. Can my brother get or file divorce even if my bhabi does not agree to it