Imran and Moin Khan were arrested on Saturday night from Govindpuri, the police said.
The victim had earlier told the police the duo had on the night of June 7 come to his house and started shouting his sister's name.
When he asked them to leave, they stabbed him. The victim suffered injuries to his face and right hand.
He had alleged one of the accused stalked his sister, but the family kept from filing a police complaint.
She had stopped talking to him and he was upset over it. He had gone to speak to her on the night of June 7.
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