The court awarded the jail term after convicting them for committing culpable homicide not amounting to murder, saying that due to the injuries inflicted by them upon the victim, a "precious life has been extinguished."
It said the convicts had the knowledge that their act would cause the death but they had no intention to kill.
It, however, refused to show more leniency in sentencing and said, "It will give a wrong message to the society."
"The interest of justice shall meet if all the three convicts are sentenced to undergo rigorous imprisonment for a period of seven years under section 304 (II) (culpable homicide not amounting to murder) and for six months each under section 323 (inflicting injuries) of the IPC.
"The sentences shall run one after the other," Additional Sessions Judge T S Kashyap said.
The court also imposed a fine of Rs 5,000 each on three convicts - Dhara Singh, 60, Brij Mohan, 50, and latter's son Dilawar Singh, 23.
Complainant's counsel N K Singh Bhadauria and Manish Bhadauria told the court that the three accused had forcibly entered victim Manish's house at Ghonda in North East Delhi and had attacked him, his father and brother with hockey sticks after a quarrel between two parties in May 2008.
Th injured were taken to hospital where Manish died while his father Mangal Singh and brother Nitish were discharged after treatment.
The three convicts had sought leniency saying they have to support their families and have already spent four and a half year in jail during the trial.
