GPA with Agreement in 1986 was executed by three members (mother and her two sons), in which it states the PGA will never be revoked and all the rights given to sell by the GPA holder.
In 1990 one of the members (mother) died.
GPA Holder has been paying all taxes and holds the Katha, in 2008 the Sell deed was executed by PGA holder to 3rd party.
How valid is this title, is it safe to purchase this property.