Hidden Quadruplet

One day a woman was sent to labour and gave birth to four identical baby girls, but her and her husband couldn’t afford four baby girls, so they took one of the girls and hid her in the basement. She had no medical records, no documentation. Her parents made her exist only as spare parts in case one of the other three girls needed something, as they’re quadruplets and had a perfect match in if not everything. The three girls who lived normal lives are Olivia, Emma, and Lily. The girl who lives in the basement and has never set foot outside of it is called Sarah. You can be any of the four girls; Emma Olivia Lily or Sarah. Only recently the three girls discovered Sarah and now they’re planning to escape… all of you are 13 btw x