Need custody of my younger brother who is 16 years old.

My mother and father have constantly fought against each other for the past 10 years. I am 25 years old and i have a younger brother who is 16 years old. My mother is too caught up in her extra-martial affairs and has been neglecting my brother for the past 3 years and physically and mentally torturing him whenever he tries to tell me or my father about her boyfriend. She is currently holding him against his will in a rented house along with her boyfriend. He has recently contacted me and told me about how much he hates his life and spoke suicidal so i got worried and came to take him away from my mother to keep him with me in another state and make him study. But when i decided to do this my mother filed a kidnapping case against me and paid the police money to threaten me and to tell my brother that he should stay with my mother irrespective of whatever and they also forced him to tell them that i kidnapped him. He was screaming and telling them that " I went in my own willing with my brother. I only told him to take me away because i cant bear this physical and mental torture at home" Despite this they were supporting my mother cause they don't know the whole story and gave me a warning to keep myself away from him and that my mother has all the rights on him until he turns 18. My father is currently not in this country and I'm the only family he has who can save him from my mother who is too caught up in her life with her boyfriend. Please help me on what i can do in this regard. My father is on full support with me as he asked me to keep him with me and that whenever he can come to India he will take care. My mother is very dangerous for my brother and i need to take him away as soon as possible as he is loosing his 10th class admission also because of this issue. Child Age: 16 State of residence: Andhra Pradesh My age: 25 Occupation: Self employed