J.K Rowling mentions that Hermione Granger has a Long Lost Sister in an interview once. she thought of this while she was writing Order Of The Pheonix. Rowling knew that she couldn't add her since it would be too late so she let the fans think for themselves. What house would this Long Lost Sister be in..? What personality would she have..? This story does not belong to me, I found it on Amino and wanted to post it, credits to the original person who created this story. None of the characters are mine.