Sir the affidavit need to be perused as husband has given her what kind of rights in affidavit based on which the property was transferred and registered in her name , further any action against the lady for property is barred by the limitation as almost 30 years on transfer.
See the property can be purchased but first the deed and the Affidavit need to be verified, further in my opinion since the deed is registered the title is clear and the share certificate is transferred it can be purchased.
if the recitals of the affidavit convey the property to the lady and then later it was registered then there shall be no problem.