my grandmother wrote an unregistered will in favor of my father
and now she's no more...
is the wiil is valid?
what if my dad sister challenge it?
The Will is valid but can be challenged by other legal heirs or anyone.
in case the will is genuine, then even if challenged, can be proved valid.
Will is not required to be registered under the Act. Your father can prove genuineness of the will in case it is challenge.