X owns a house. X died & after that Legal heir of X, say Y, came to know that X gifted the house (registered gift deed) to her sister, say Z. The gift deed was not executed, I mean, no name transfer happened from X to Z for thr house.
What are the possible Legal options for Y to cancel the gift deed & Y can rightfully claim the property.
Note: The property is locked and no one is occupying it after X's death.
Requesting guidance from Legal Experts.