Change the current Proprietor of a company

My parents in India are facing problem related to their company they established 30 years ago, which their daughter in law after my brother's untimely death is trying to take over. Last year in December due to my brother's unexpected death at a young age, my father made a wrong decision to transfer proprietorship in her name with a good intention and her fake pretense. But unfortunately it rebounded, this was actually the worst step to be taken by anyone, not sure why would he make her the owner of the property. And now he is repenting and feeling remorse because she is going against every decision my father makes. My brother was living outside for 3 years and wanted to divorce her but she was not ready to separate because her mother always influenced her and interfered in their life which forced my brother to leave her and live away from home. Is there a way out to make my mom or dad the Proprietor of the company? She became the Proprietor this January after my brother's demise. the properties of the company is in my mom's name. Please advise, how can this issue be resolved? My father built the company from the scratch and have been running it. He is diabetic and had a by pass surgery 4 years back and her actions will deteriorate his health, already my parents are dealing with the deep grief of my brother's irreparable loss. Thanks