Niall Horan's Long lost sister

In this story Ivy Rose Horan lives with her adopted abusive parents Tina and Mark. She is a senor in High School and is wanting to escape from both her abusive adopted parents and her dreadful highschool life. After her parents leave for a holiday Ivy finds her birthcirtificate and finds out her brother is Niall Horan from One Direction and she is off to find him.