Unable to see my 6 year old boy

Hi, I was staying in abroad with my wife and kid, I never had an amicable relationship with my wife, she has physically and mentally tortured me for the last few years however as we have a child I never thought of separation or any legal actions against my wife. In the month of October in the pretext of a short trip my wife went to India with my son and then completely stopped communication with me. I learned she has left my son in her mother's place and working in a different state. They also did not admit him into any school, I have managed to talk to my 6 yrs 7 months old son through video call and i found him very upset as he doesnt have his mother or father around him. They are financially not well equipped and I doubt they are able to take proper care of my son. I had a brief chat with my wife and she clearly said she will not let her son to be with me, i can go and vist him once or twice. I want to take the entire custody of my son as I feel I that I can give him proper education, healthy lifestyle and mental support. During these many years my wife did not contribute a single penny into our family or well being of my child. It was always me. What all the options I have here Note- None of us has filed any divorce.