This is your query: We received a gift of 4 acres agricultural land from a relative. And we registered on 2010 with gift deed in f/o family But problem is we mentioned donor and donee is brother and sister of same father but they are not.
The underlined sentence is a misrepresentation. The relatives need not show such a relationship that is not true even if some one gives 4 Acres a gift, he can state the reasons for giving such a huge gift to some other.
There was evasion of requisite registration and stamp fee to Govt.
If due to misrepresentation, some entitled sharer is deprived of their rights, the deed can be challenged by those victims.
The court can only declare its validity. Contact a local advocate as there are many ways to sort out the issue if the deed is not challenged.
If someone challenges it, defend yourself.
Once a deed is registered that can not be canceled/modified after a decade.
Only a competent court is having such powers to declare the validity of the deed or power for cancellation.