Imminent separation leading to child custody

I have a problematic marriage with constant verbal altercation between my spouse and I, we live with my parents in thier home and have a 2 year old son. She is a working woman and I am a stay at home parent. I look after the baby while she is away. We have differences and they do not seem to be coming to an end. She also is trying to draw a wedge my parents and I by telling them things of which only was privy so that it breaks their trust in me. I do not wish to let go off my son for multiple reasons including that my parents and I are in a better financial position and have better educational background to make sure his future and education are secured. My parents are ageing and can not leave them alone as I'm the only child. I'm a Hindu.