Additional Sessions Judge Manoj Jain freed north-west Delhi resident Varun Chauhan and Navpreeta Kaur, sister of victim Tejyash, saying the prosecution has not been able to prove its case to the hilt.
The judge also said it was court's duty to ensure that mere suspicion does not take the place of legal proof.
"Distance between 'may be' and 'must be' is quite large and divides vague conjectures from sure conclusions. In a criminal case, the court has a solemn duty to ensure that mere conjectures or suspicion do not take the place of legal proof," the court said.
The court said the prosecution story was replete with infirmities and suspicions and all the links were not proved in the desired manner.
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According to the prosecution, on July 22, 2014, Tejyash's mother found him lying in a pool of blood and called the police. He was taken a hospital where he was declared dead. Tejyash was preparing for class XII examination.
The police had claimed that Chauhan had confessed to the crime and also said it was Navpreeta who had helped him enter the house to murder her brother.
During the trial, both the accused persons denied the allegations. Navpreeta said Chauhan was just a friend and she had no intentions to marry him.
The court also said "since the house was left unlocked and unattended, anyone could have gone inside for committing any offence.