How do I disown my father

I want advice as to how I can take action against my father for humiliating my mother, Socially and many more things. I am a student of Class 12 wanting to go abroad for further education... I have consolidated my mother as to doing this legally wont have any affect on my studies or me going abroad (for which I will need my passport). I am a bright student. I do all my work diligently and with extreme hardwork and dedication. I am respectful to my adults, I mightve got carried away in this conversation(which I just now uploaded to google drive but am not willing to share yet), but I really want my mother and my sister to face justice against this man. His family asked for dowry from my late Maternal grandparents, to whom she said to refuse to pay any. My mother is an extremely hard-working person, she has taken care of me and my sister for 5 years of my life during the age of around 10, when I was in 5th Standard(an episode broke out in front of our school headmaster too then) till when I was 15, when I was in 10th standard... Around August, when I was in 10th, I was very happy to think that my mother and father had resolved their issues between them, only to realise that 2 1/2 years after that, My father still blames my mother for every small thing that she did... He follows a stupid cult called Brahmma Kumaris, since after he asked us to leave. Quarrels were common by the time we approached that dreadful day that evening, when he not only insulted my mother publically amd humiliated her, and asked her to "take the kids and LEAVE MY HOUSE". It was a memory I dont easily forget, Every time I am reminded of that story, The whole rollercoaster follows.. I wont disclose any details. But I just wished to know what do I do to take legal action against my father if I can and whatever problems will I face...