- Since, your grandfather had built the said house from his owned hard earned money , hence that house was his self acquired property ,and he was having his right to transfer the same to any one , without any hindrance from any one legally.
- A WILL is not mandatory should be registered , but it should prepared in the presence of two attesting witnesses .
- Hence, if the said WILL is having only signature and two witnesses , then after the death this property become the self acquired property of grandmother.
- Further , legally your grandmother was also having her right to transfer the said property as per her wish , and hence the gift to your father and daughter was a valid Gift deed , if it was registered as per law.
- Further once a gift deed registered , it cannot be cancelled legally , specially when the property came into possession of your father, and without a court order a gift cannot be revoked.
- Hence , further gift in 2017 is having no value in the eye of law.
- After death of your father in the absence of any WILL , the said property would be devolved upon his legal heirs , i.e. his wife , son and daughter.
- Hence, legally your mother is not having right to claim on the entire property , but a release deed from other legal heir like you can give her full ownership of entire property.
- Since the gift deed executed in 2017 is invalid , hence for cancelling the same , you or your mother can file a suit for declaration before the court to declared the said gift deed as null and void.