How should I proceed

Hi, I am writing this email regarding the mental harassment my sister and my family facing due to her in laws. I will try to explain it in the details. I belong to the Hindu bharwad caste where child marriage was a normal thing until few years ago. I(Sanjay) and my sister's marriage was fixed when we were kids to the same family. My sister went to her in laws house when she became 18 years old as per tradition. I married to the sister of my brother in law(jija ji) when i was 10 years old, even though i was just a kid but i stil remember refusing it. but i was too small to do anything. everything was going smooth until 2014 where despite my objection and wish to study further they forcefully(emotional force) sent mywife to our home as per ritual for 10 days. I was told that if i reject this proposal they will send my sister back home and keep her kids or in worst case they will kill her or her kids( yes, thats what i was told and that fear was always with me ) so i had not other option but accept it. There was no emotional connection between girl and me though my sister already had 2 kids by the time my wife came to our home. After good explaining from my family members i thought i should give a try to this relationship, also as we were financially weak i never had much choices. in 2015 i planned to do masters in sweden and both the familes agreed as i was adamant to study further. but my in laws never liked it as they wanted their daughter in india and as close to hem as possible. though we were technically married but we were not leaving together as i was in sweden and she was at her fathers house. when i came to sweden they started mentally harassing my sister as they thought if they do that i will be forced to come back but as any sister would do my sister never told us anything but in 2018 we eventually came to know about it, and they told us if their daughter is not happy then my sister will have to face the consequences. after that my sister complained to my parents as it was beyond her tolerance, they were mentally harassing her and her kids. so, both the family gathered and decided that i will have to take her with me(by 2018 i started working so i could afford expenses) so, we legally got married in 2019 even though it was against my will and even my families wanted to break the marriage but they were worried about my sisters life and her kids future as they told that if we break marriage they will take my sisters kid out of school and send my sister to our home , they wont allow my sister to see her kids. but as there was no emotional connect between meand my wife, i could not take anymore and i firmly told my family that i can not keep this marriage anymore. i even told the girl that I wont be able to keep her happy and i told her about my feelings. I tried to explain everyone as politely as i could. my family thought its better to break marriage than losing me as they thought i might do something stupid. so, in november 2019 again