Legal possibility to challenge a registered relinquishment deed

Hi Team, My mother side grand father & Mama took registered hakka sod patra from my mother by giving only 200,000/- where as property value was more than crores in the year 2007, also made fake promises about ownership of my marriage expenses. Also they told fake reason to take get sign & photo from by mother in register office. Also they did not allow to read the papers on which sign was take. And when she signed that papers she was taking treatment of hypertension due family issues. Is it possible to challenge registered hakka sod patra in the court and get fair compensation for the same.