Child Custody

Dear Team, Requesting team to help me and my sister who is suffering from last three years by answering few queries. We are from lower middle class family and we cannot afford big fees to expansive lawyer, hence seeking your help to get the right answer from experts. We have filed a divorce case under cruelty to bring my sister into normal life but the case was running for more than two years and her life is completely devastated, she is also having a 3 years old son who is her primary focus . Understanding all circumstances all concern party agreed to go on mutual consent for separation. Her husband has requested from court to allow him to meet his son(3 year old boy), court has granted a permission he can spend a day once in a month. Queries: 1. My sister work at Kolkata in a IT firm and now she is planning to relocate in Bangalore for better opportunity and stabilize her life and son. What are the legal implication in her transition from Kolkata to Bangalore? Considering the scope court has granted permission to her ex husband he can meet his son once in a month. 2. My nephew is 3 years old, he has never seen his father and it may time to get him acquainted to his father but how can we give custody even for a day to person who has not shown little respect for her wife or son and now he is coming with such permission. Kindly suggest. 3. As we has cruel to my sister, he was mentally and physically tortured my sister for years. I cannot him to be different person what he was in case if we get any sign of cruelty toward my nephew. What should we do? Thanks & Regards, Rohan