Taehyung and jungkook have a sister. KIM YN. Yn was born with a weak heart, so her parents try to abandoned her. But the brothers loves her a lot, cause they always wanted a sister. They take the newborn baby and left their house. After leaving their house they meet Jin, Yoongi, Namjoon, Jhope and Jimin. They all became a family and helped them to raise yn. They loves her a lot. And she loves them a lot. Sometimes they are strict towards her. READ TO KNOW MORE ABOUT THE 3 SIBLINGS.