Widow mother rights in divided sons property

Hello Legal Experts- Person X holding certain land asset with his name and he expired suddenly. Now person X legal heirs are  Person X - 1. Widow Mother, 2. Wife, 3. Son, 4. Daughter1  5. Daughter2. Now mother is 80+ years old and asking equal share from person X land asset.

But his mother and father was holding certain shares when the actual divison happened from Person X and his brother, father and mother. Now still she expects another share from person X.

So kindly advise is there any chance where Widow mother can write UYIL for Person X property share to anybody else without NOC/agreement from remaining four legal heirs? BTW we are in south india.

thanks in advance for your assistance!!