My grandmother Nani in her last registered will which was also signed as a witness by her legal heir my mama gave me and my kid sister and brother her entire property disowning my mama and my mother.in 1988 she expired we were kids.after attaining majority my uncle mama and mami started emotional blackmail..they got us sign the disclaimer deed in 2005 for that property..can disclaimer deed is enough..as we bacame the owner ofvthe property after her death in 1988..either we can make a sale deed or a gift deed..in the will it was written that no matter what my mama if adopts any child will not get anything..now we have challanges the disclaimer deed in court after the demise of my mama..and his adopted girl is claiming the whole property..plz experts I'm waiting for ur valuable opinion..thanx