Please, your my last hope (Harry Styles Fanfic)

Harry Styes. 1/5 of One Direction. What happens when Harry is at a meet and greet and his long lost little sister Ally Styes shows up? What will harry do when he finds out what is happening to her? Will Harry protect her? Does Gemma and Anne remember her? When Ally has some certain medical issues will they band and her family be there to help her through it? Or will she be left alone and go to an adoption center? Ally is just a hopeless 8 year old girl her needs her older brother to save her. After all Harry is her last hope...