Cancellation of Settlement deed by Senior Citizen Act

Sir, My father was defense pensioner has some debt for my elder sister marriage in local finance to close that loan. We approached for bank, but due to elder sister having another loan my father and elder sister was not eligible. Bank itself gave solution to convert the property to elder sister via unconditional settlement deed and his husband and her was having loan eligibility in 2014 and loan repayment was done by father pension. My father was expired in Mar 2016 and am younger sister got marriage in 2017 with help of husband family. And my elder sister not ready to bear any expenses for my marriage. My mother was psychiatrist patient since 1995 and taking care by me and loan repayment was done by mother pension. Now my elder sister denied to provide any share to me and my mother and also planning to demolish the home and planning to construct new building there. My mother age was 59 now after 2 months only it's 60 We request to advice via senior citizens act help us for cancellation of Settlement deed.