The accused -- Didar Singh, his wife Kulwant Kaur and son Gurwinder Singh, all residents of Manawali village -- have been booked under section 306 (abetment of suicide) of the IPC in connection with the suicide of SAD leader Buta Singh (63).
Didar Singh's another son, Parminder Singh, has also been booked, but was evading arrest, police said.
They have been booked on the basis of a suicide note left behind by Buta, SAD's Phagwara rural block vice-president and 'Nambardar' (village head) of Manawali, who had committed suicide on May 9 by consuming poison.