Besides the life term to the girl's two brothers Dilshad (31) and Naushad (28) and their relative Hasin Hussan (34), additional sessions judge Inderjeet Singh awarded the jail term to their neighbour Naushad (35) for also attempting to kill the sister of the boy due to the family feud.
"Imprisonment for life means till the life of convicts exists, it stands clarified," the court said.
The convicts had on March 27, 2006, illegally entered the house of their neighbour Ishrat, with whom their sister had eloped, and murdered his mother Anisha and brother Pappu and attempted to kill his sister Heena by shooting at them and stabbing with knives.
The court noted that the convicts and complainant were neighbours and the bitterness among them was a family feud as Dilshad's sister Shabnam had married Ishrat without her family's permission.
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According to police, the eight accused had conspired to kill Shabnam, her husband Ishrat, Pappu and Anisha and other family members on March 25, 2006 in northeast Delhi.
The accused had trespassed the house of the victims in the night and caused injuries to Pappu, his mother Anisha and sister Heena with country-made pistols and knives, it said.
They had assaulted the victims after tying them on the roof of their house. While Pappu and Anisha succumbed to the injuries, Heena is still undergoing medical treatment.
The convicts sought leniency on the ground that they are not involved in any other case and they are not dangerous for the society.