While Kulbir Singh (45) and Gurmit Singh (32) died on the spot, Karnail Singh (40) died on way to civil hospital here.
Their fourth brother Gurdarshan Singh, who was seriously wounded, was admitted to the hospital where his condition is stated to be out of danger, they said.
They are sons of Kartar Singh, while the accused belonged to the family of Kartar's brother Sohan Singh.
SSP Gurpreet Singh Toor, who rushed to the spot, said 14 persons have been booked under various sections of IPC besides Arms Act and three persons have been arrested.