Mutual consent divorce

Dear lawyers My brother had a love marriage without informing my parents and from the same date they rented a house and stayed seperate from my parents. They have a son who is now 5 years old. When the child was of 8 months my brother met with an accident which was very serious. Luckily he recovered He got discharge from the hospital after 45 days. After coming he asked his wife to go to our parents house as he was physically not fit and the child was very small. So she agreed n after reaching at my parents house she went back to the rented house, called her father n asked him to take her from there. Her father agreed and that night took her away without informing anyone. The next day we came to know that she left for her father's place and no one should call her. Since my brother had undergone a major surgery it took time for his recovery. Now that he is ok n it has been 5 years they are seperated he wants her to come back with the son she is asking for divorce on mutual consent. We discussed n agreed her proposal n filed application for the same. Now 7 th November is their final hearing n now my brother decided not to attend the date as she called up my other sister n used abusive language when she asked to hand over mangalsutra that we had put on the day of marriage. Pls advice what to do as we want her to come back n take responsibility of her husband as my parents are very old and brother is still recovering as he underwent neurosurgery.