1) when was the fraud discovered? . file criminal complaint for cheating , criminal breach of trust , forgery under section 406 , 420 , 468 , 471 of IPC against the persons who forged the signature .
2) you will also have to move civil court for setting aside transfer of share in property and for cancellation of partition deed on account of fraud .
3) bank cannot be made party to partition suit . in the event bank takes any proceedings for sale of property file an intervenor application for stay of sale of the property