Deceased Daughter's (died 2003) children's claim in deceased father's (died 1991) property.

The property was granted on leasehold basis to Great Grandfather in 1950 which was transferred to my Grandfather in 1970 with his all alive siblings giving their respective NOC's. My Grandfather by his own hard earned money built a house on that property. He had 5 Children, 04 male and 01 female, my father being the eldest. My Grandfather willingly in 1989-90 transferred the property name from his to my uncle through Proper Affidavit and Notary at that time and proper Society norms and procedure on which his name was deleted from Society Share Certificate and My Uncle's name was added. During this time my aunt was unmarried and was of around 18. My grandfather died in December 1991. After which my aunt was married in Feb 1993 followed my Grandmother's death one week after in Feb 1993. After being married for 10 years in which she didn't raised any claim, complaint, notice or kind of, she died due to an accident in August 2003 leaving behind her Husband and 02 children, one son and one partially mentally retarded daughter. Now after nearly 14 years after her death and her husband being remarried, her children have staked a claim in the above property, stating their right as per law. kindly help out in this matter, do their claim stands in court of law.