Divorce case

My brother’s marriage was court marriage in September 2019, since then his wife is in Canada for her higher studies. She had stayed with our family for 5-6 days in this whole period. My brother went there or dependent visa in December 2020. But things were different now. She is changed, and not respecting him, playing with his mind, used his money, abusing him, torturing him mentally by saying things like I will give you in police custody here if you dare to ask me anything. You are here because of me. Meanwhile also cursing me as I confronted her once regarding the issue. My brother beared the mental torture and returned back in June 2021. Now she is torturing if he files a divorce 1)she will never come back and sign the papers. 2)she changed her address where she used to reside in Canada 3) my brothers in laws are fully supporting their daughter and have not even called my brother since he is back in the country. And they are saying we have married our daughter in your house it’s your headache. 4)since my brothers arrival my sister in law have not contacted him yet. So please advise us. The possible ways to file a divorce (as we all are sure that this marriage is never going to work).