Need suggestions on legal heirs

Hello Team of respected lawyer's, I'm writing From Bangalore. My sharing of the situation I am at, thoughts and questions are regarding my wife's property. - my wife has a property registered in her name solely, which was earlier in dual ownership that was on my wife's and on my wife's mother's name. Later my wife's mother willfully decided to write the property on her daughters name and so my wife became the sole owner of the property. We do not have kids. - Very shattered and unfortunately? I recently lost my wife due to both kidney failures. After a week of my wife's demise, my wife's sister in law that is my wife's brothers wife ( my wife's brother passed away 2 years ago) has brainwashed mother in law and have been in possession my personal belongings like everything right from my clothes, certificates, electronic devices, and everything which belongs to me and I'm not allowed to take my own personal belongings stating I would get my personal belongings only when I submit all my wife's documents like aadhar card, death certificate, my wife's phone, and also they want me to surrender my nominee for my wife's bank accounts and also they need me to give in writing I will not ask for possession of my wife's property for which my wife is the sole owner as I have mentioned above. I do not want to return my wife's belongings at any cost to my mother in law ( although I understand it's my wife's mother) or to my wife's sister in law. I have been living with my wife and my mother in law in one house ever since I got married understanding the situation that my wife had lost her father at young age and an ailing old mother, so I and my wife wholeheartedly and willfully decided to sacrifice and take care of her mother along with us. Although my mother in laws son lived next-door, daughter in law never cared for her in any aspects of life pre and post sons demise. Now post my wife's demise, she ( my wife's sister in law) has brainwashed mother in law and has instigated false information against me and not allowing me to take my personal belongings, unless I surrender everything which I don't feel like, as I understand I'm entitled with my rights. I understand that these are not proactively and willfully done by mother in law as I know she is not such cruel, stone hearted women, my mother in law is wonderful human being a true hearted women. But, unfortunately taking advantage of my mother in laws age and creating fake sympathy her daughter in law is taking advantage and has instigated very unnecessarily. My questions and suggestions are : - How could I take my personal belongings from my wife's house. - How could I ensure I get the right of my wife's property and make it on papers legally. Kindly help me. Regards, Shattered man, husband and son in law.