Another you

Summary:
A girl is attacked by her identical double in an alley, but her mother doesn’t believe her. The next day, the mother discovers the horrifying truth: her real daughter and the family cat are tied up and hidden under the bed. At that moment, she is attacked by her own double. The story ends with the impostors—the mother, the daughter, and the cat—usurping the original family’s place to stay in this dimension forever.