The court said it was a "rarest of rare" case in which the brothers initiated the crime.
Additional Sessions Judge Kamini Lau said that keeping in view the nature of the crime and the manner in which it was planned and committed and the conduct of convicts Sunil and Sudhir, they do not deserve any leniency.
"Certain category of perpetrators of crime who, if not removed from the circulation of the society, would destroy it and this act of convicts Sunil and Sudhir in brutally and publicly silencing the voice of a brother, who had dared to stand-up against them to protect the honour of his sister, has invited extreme indignation of the community and shocked the collective conscience of the society...," the court said.
"This battle of one half of the Indian population (women) is something that we cannot lose sight of and the courts of law cannot let the things pass in the name of compassion/ mercy," the court said.
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"...Accordingly, they both be hanged by the neck till they are dead (subject to confirmation of High Court of Delhi)," the judge said while pronouncing the verdict.
The court also gave to life term to convicts Surender, Suresh, Raj Kumar and Sanjay and imposed a fine of Rs one lakh each on them which would be given to Subhash's family as compensation.
The 19-year-old girl was also watching the celebrations along with her mother when at 11:30 PM Sunil and Sudhir, who were local ruffians with several criminal cases pending against them, passed through the street in front of her house and made obscene gestures to her which were objected to by her brother and her mother, the police said.