Khata transfer to my name after father's death

My father died 3 months ago, death certificate is available with us. We have a small property (11*26) at our native place. I have my mother and married younger sister. I understood from your website that we need not have Re-Registration, but transfer of Khata is required. Questions are: 1. My mother is Cycology-Paralysis-Eplilepsy-Sugar patient with loosing her memory and vision problem too. At the age of 71 she cannot travel much. My younger sister is not interested in this property. Is it possible to transfer Khata to my name only? Or is it MUST to transfer Khata to all 3 of us? 2. Recently I found there is little difference in my father's name in Property papers vs Aadhar & Death certificate. How to proceed? 3. I took care of my ill Father till his death, now taking care of my mother too. Both were patients, lot & lot of expenses bared from my pocket. Even though my sister is not interested in this property, is it mandatory to share profit from the property to her? Thanks Kumar