Good Afternoon,
Your neighbour, having executed valid release deeds and registered the same in the name of your brother, seems to have no material legal basis for the same, especially if he was not able to bring forth any evidence to support his claim initially. Still, the filing of a civil suit brings a legal imperative to respond appropriately and place their claims under counter.
To counter this threat, you should emphasise establishing documentary evidence that proves your family's unbroken ownership. This includes the original copies of property documents, registration release deeds signed by both you and your father's sisters, and older records tracing the title back to your grandfather. You are able to show the true nature of your brother's title and discredit the claim of the neighbour by emphasising all these records in your written submission.
Since the neighbour has filed a civil suit, any fraudulent documents they have submitted should be scrutinized. If forgery or fabrication is evident, you may consider initiating criminal proceedings under relevant sections of the IPC for fraud and forgery. If their claim was frivolous, they would be able to have the suit dismissed for lack of cause of action by making an application under Order VII Rule 11 of the CPC, and that can expedite the case being resolved.
Litigation can drag in and be very draining. For success, however, maintain detailed documentation, get referrals from experienced legal professionals, and proactively advance the case at each turn. Engaging an adept property lawyer who understands what is required locally ensures better protection of your interests.
Regards,
Sankalp Tiwari
