Yes, you can get the gift settlement deed cancelled however the onus will be on you to show to the court that it was done by fraud. Now that your uncle is also not alive anymore, proving fraud gets even more tougher. So, based on any other evidences, take a decision.
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You uncle would have appeared before the registrar for registration willingly? Do you have anything to show that there was undue influence?
Adv Shailendra Dubey