1. Ancestral property is defined as the property whose title has not changed for last 4 generations i.e. from great grandfather to great grandson without being interrupted by any partition/settlement/sale/gift deed or will. If it is not so, then it is not an ancestral property.
2. If it is not an ancestral property as defined above, no consent letter is required to be taken from the son of your uncle by your father or uncle while buying or selling the property of your Uncle.
3. Accordingly yo need not respond to his claim for return of the said property legally purchased by your father from his brother.
4. If it is an ancestral property as defined above, the consent of the great grandson of the late title holder in whose name the property still stands, shall have to be taken while dealing with the said property.