On what grounds can a registered sale deed be cancelled?

Sir MAINE EK PLOT PURCHASE KIYA HAI JO KI 13 DECIMAL KA HAI JISME 9 BHAI KA SHARE THA HUM 9 BHAI SE REGISTRY KARAYE HAI, BUT EK BHAI KA LADKA KH RAHA HAI KI AAPKA DEED CANCEL KARA DENGE HUM SE SIGN KAHE NI KARAYE, PAITRIK SAMPATI THA...