My father, in his final days, signed a document witnessed by a nearby lady notary. She stamped it with her official seal and registration number. Now, my brother is challenging this document, claiming it’s invalid because it wasn’t registered and lacks the notary’s docket number. Is his argument valid or just a tactic to create trouble? Please advise.

Your brother’s argument is likely a tactic to create trouble. While registration of a document and the notary’s docket number are good practices, they are not legally required for a document to be valid in India. The document’s validity hinges on proper execution, witnessing, and the notary’s seal and registration number, all of which appear to be present in your case.