My grandfather had a self-acquired property and had 3 legal heirs 2 sons and 1 daughter( my mother) respectively. 2 sons didn't look over my grandfather and used to create nuisance, so out of agony my grandfather transferred the property in the name of my grandmother via registered gift deed. Now my grandmother gifted the same property to my mother via a registered gift deed, now my question is:
Is the said gift deed valid?
Can the other 2 legal heirs challenge the gift deed?
Should my mother take an injunction against the other 2 legal heirs?
Thanks in advance.