Abatement of suicide by inlaws what legal action can we take

 My sister was married for 10 years to a very violent, abusive and chronic alcoholic person. He beat her up regularly, and even his mother, sisters and her brothers in law tortured my sister no ends. After one such incident, I brought my sister home, but could not get her two kids with her. After a few days, my sisters' in laws and husband started approaching us for a reconciliation and requesting us to send my sister back to her inlaws. After around 20 days of persuasion and the fact that my sisters didnt have her kids with her, based on the assurances from her in-laws, she left in the night of 22/11/16. Then we got to know in the afternoon of 23rd that she had attempted suicide by consuming depressant tablets. We took her to hospital and somehow have been able to save her after she stayed in ICU for three days. Now she is staying at my home. We have given a complaint of this incident to the police on 27/11/16 what should we do now