cancellation of settlement deed

It is believed that you are Hindu.

Confirm!

The property was owned by Grandfather.

It should devolve upon ClassI legal heirs equally.

The title of your query is Cancellation, of settlement deed.

The lady can not dispose more than her share/or more than she owns.

Property and all corporation tax do not confer ownership.

You may approach a very able local counsel specializing in revenue/property/civil matters for a considered opinion.

Your counsel may opine that registered settlement deed can not be unilaterly cancelled and advise you further on option, remedies and merits.