Bhagwan Singh and his son Yodha Singh were shot dead by constable Parminder Singh and his associates. Parminder is the son of a former sarpanch of Kahlawali village, Virsa Singh.
Two persons were also injured in the firing, police said, adding that a case had been registered against eight persons over the incident.
Police said that there was a dispute between Virsa and Bhagwan over a plot of land where both parties used to dump garbage.
No arrests, however, have been made so far.
The injured have been admitted in hospital where their condition is said to be stable, police added.
