Registry of flat with gpa

Dear Rajeev, didn't understand your question ???? Please be clear.... 

Dear Sir,
My mother bought a property in NOIDA about 15 years back under a general power of attorney. She got the same registered and an agreement to sell was also registered wwith the registar. The person from whoem we bought the plot had also purchased it in GPA. So my mother holds a second GPA. Now we want to register the plot in my mothers name. The person from whoem we bought now has become greedy and is asking for an exorbitant amount. We have been advised by our lawer to negotiate with the transferer(1st GPA holder) as if something happns to him the GPA will become invalid and will automatically be taken over by govt. The original owner has already expired. Noida authority does not allow transfer by second GPA holder otherwise she would have transfered to myself. Please advise.