Person wants to claim the property which is already sold by his father

Dear Sir, My father had purchased the 8 dec from X person in the year 1986. X person is expired. Now we came to know that this property was minor's property that sold by his father as guardian without court order. In the year 1986 minor's age was 6 years. Due to economical problem his father sold this property to X person. Now the minor's age is 38 years old. Can he claim this property from my father? Kindly help us.