Cancellation of settlement deed

This is a case of my close friend Mr Raja . His father Mr Viswanath settled one half his self earned property (land +house) to his married daugter Mrs Lakshmi in July 2007. It is a irrevocable unconditional settlement deed , the same registered in the SRO. Mrs Lakshmi did not take possision as she lives with her husband who owns a house in city nor change the names in the corporation, Metro water & EB. Since Mrs Lakshmi does not have any children she made a settlement deed to her only brother in March 2008. However, Mr Viswanath with any information to his daughter cancelled the selltement deed in Feb 2008. Both Mr Raja & Mrs Lakshmi filed a suit in the city civil court with a prayer to declare the revocation deed NUL & VOID. After trials the judge dismissed the suit on the basis that Mrs Lakshmi did "NOT Act upon" on the settlement deed. Pl guide on what remady is there for the brither & sister to claim the property. .