Seek advice

It's my second marriage. I got married to an engineer 5 years back , I was a widow with a 10 year old son that time. He was a divorced with a daughter, but his ex wife has daughters custody. He legally adopted my son , he was working in kuwait so two weeks after marriage he left got kuwait . But during those tell weeks I found out about his past affairs and I sensed that he didn't want my son, he just adopted him for namesake. I thought of giving him time . When I and my son got the visa and passport and moved to kuwait after 10 months. I found out that he was literally torturing me and my son,he slapped me even tried to hit my son. My son got scared and requested my late hubby's parents that he would stay with them. After returning to I dia my son started staying with my ex in law and now he is with them , they are spending for his education. I am not taking any money from my hubby for my son's education. I was depressed when I had to leave my son in india and return to kuwait again because my husband threatened me to file for divorce. But I manage to stay in india with my son for few months and few months abroad where my husband is currently working. We usually have fights over this issue, that my wish was to form a family and live under one roof with my son and husband but his parents are aldo not happy accepting my son. Due to lockdoen I am in maharashtra with my parents abd want to go back to bsngalore but my husband and his mother are not giving the house keys to me. I dnt have enough bank balance also. He often slaps me and uses very abusive language, when I sm in india with my son I have to face very filthy words on whatsapp messages, and I tried to seek his parents help in this matter but they never asked their son to change his behaviour. He always keeps me away from my son. For my parents reputation I have been tolerating till now , but now it's unbearable for me . Please guide me what should I do