Ram is survived by his parents ( father & mother ) and has two siblings. Shyam ( Younger brother of Ram ) and Sita ( Elder sister of Ram ).
Sita left home(including parents) during 2009 at an age of 19 and married a guy from another caste of her choice. Parents were not in favour but sita refused to listen to parents and ran away from the house.
After 15 years now sita is survived by one daughter and divorced from her husband.
Sita's parents and her brothers are not interest to accept sita anymore and rather doesn't want to give any share to sita in the property in the name of father & mother.
However from some sources Ram came to know that sita could cliam the property in future.
What should Ram & Shyam do legally to protect the property from Sita ?
Note: Parents are with Ram & Shayam.