Property dispute

Dear Sirs, Please provide your valuable legal advice (point-wise) on the following matter on behalf of my relative: X is the native of Southern India, say Tamil Nadu and works in a company in North India, say Mumbai with family. Y resides in Tamil Nadu. X has a property dispute with Y in Tamil Nadu. Y’s father has registered (in the office of Sub-registrar in Tamil Nadu) the property of X in Y’s name as gift deed unlawfully. So, X filed a case in the court based on the written advice of Sub-registrar. The case is in the court. As X is required to travel between North India and Mumbai due to job requirements, X has given General Power of Attorney to Z, who is a close relative of X. Y submits an application to the District Registrar Officer (DRO) in Tamil Nadu saying that X has one ration card/Voter ID in Tamil Nadu and another in Mumbai. Since, an Indian citizen is supposed to have only one ration card/ Voter ID, the Power of Attorney of X is to be cancelled. X is not aware about the fact that a citizen must have only one ration card/ Voter ID till now. Please provide your valuable legal advice on the following 3 nos. of focused queries: 1) Does the District Registrar Officer in Tamil Nadu have the authority to cancel the Power of Attorney based on the application/ reasons submitted by Y, when, (a) Power of Attorney is registered with Sub-registrar office in Tamil Nadu, (b) case is already in the court? If yes, it is under which Section of the Registration ACT? 2) If by chance, X has one ration card/ Voter ID in Tamil Nadu (due to his native place) and another in Mumbai (to have some address proof, which was the requirement in yester years), (in both cases X is not using to obtain any food grains. Gas cylinders etc. at Public Distribution System at concessional rates and Mumbai has cancelled in Dec. 2009 all the ration cards, those were not renewed), then, (a) Is it wrong as X was really unaware about this? (b) If it is wrong, what are the best defenses available to X, so that X can overcome this problem? (c ) Is there any web site to check these details? If yes, Please inform the web site address. 3) If District Registrar Officer calls Z for enquiry, then, (a) Is Z entitled to obtain the copy of the application submitted by Y for verification and explanations? (b) If District Registrar Officer refuses, what remedies does Z have? (c ) If District Registrar Officer cancels the Power of Attorney, what are the grounds possible? (d) If District Registrar Officer cancels the Power of Attorney, what are the options available to Z?