Separation Of Couples

My wife verbally abused my mother after my marriage. my mother left house and lives ALONE in our native place. I live with my wife at chennai. But now, Mother's health is deteriorating and she needs me badly. But my wife is not willing to accept her again into my family. Right now, I came to my native to take care of her as she underwent cataract surgery. Looking at her health, she needs me to look after her. But my wife is not willing to take care of her at Chennai. If I decide to stay with my mother permanently at my native without visiting my wife, my relatives are saying that my wife will file a complaint in police station saying that my mother spoilt her life by asking her son (i.e., myself) to stay along with her leading to my separation with my wife and hence requesting police to fetch me in person physically. I cannot leave my mother for an abusive wife. But need legal advice on what if my wife files a police complaint. How to separate from her to look after my mother. Pls help