Wife not returning home back after delivery from 2018

My wife delivered baby in Bangalore and my inlaws took her to their native after delivery. Post 7 months, we tried to bring her back home and inlaws created problem telling we will not send for one year. We tried several times and they started abusing for no reason. We tried to discuss along with few elders in the village and they didnt respect them too. When i go to see my wife and son, they use bad words and start abusing. Their relatives gather and they treat very badly. one of her Aunty literally poked my face saying she will not send her. I have tried talking to my wife to convince her and bring back but she refuses saying i will not come now and she has sent few whatsapp messages saying not to come for calling her and not sure when she will come to my house. I really dont know what is the reason for her staying with her parents. I have my Mom and Aunt with me who both are cancer patients and my Mom is in her last stage of cancer. I am really disturbed in life and blank. Please advice if i need to send a legal notice or wait till her mind changes?