The incident happened last night when the victim's mother returned home and found her daughter in compromising position with a tenant in her room. While the tenant managed to escape, the victim's mother smothered her with a pillow, a police official said.
The victim was about to get married in a day and the house was full of guests.
According to police, the matter came to light after Lok Nayak hospital authorities called the police when the mother and her son brought the victims' body there and tried to get her admitted claiming that she had attempted suicide.
Following investigations, a case was registered and the victim's mother and brother were arrested today, the official said.
The family belonged to Meerut and had fixed the victim's marriage with a Ghaziabad-based businessman, police said, adding that the victim was in a relationship with the tenant.
The victim's father died a few years ago, after which her brother took up the job of an electrician in a factory, the official added.