My wife doesn't allow to meet my mother/children of my late brother

Hi, I was married in 2008 and in 2015 my father and brother expired. Now I live on the ground floor and family of brother lives on the first floor. Mother earlier lived with me but now for the last 2 years, my wife doesn't like me talking to my mother and brothers kids. My mother itself cooks food for her. In January there was a quarrel in between me and my wife. She took a knife and tried to cut her hand(she has done this before also) and called the police stating that me and mother has beaten her. The policemen came and ask to sort out the matter in the night else file a complaint in the police next day. Next day her relatives came and filed a complaint in the nearest police station. His uncle slapped me in front of police and later on the dispute was settled on mutual consent of both the parties. Now my mother and my family lives in separate portions on ground floor. She still doesn't stop and fights with me for talking to my mother. Recently I lost my job and very stressed. Please advise. I have 2 kids above 5 years of age.