Harry never knew this but he actually has a Twin Sister. Her name is Rosaline. Rosaline Potter. She has 3 best friends they are Aurora Lupin who they just call Rory, Gabrielle Johnson aka Gabby, and Karma Black . They're the daughters of the great Marauder's minus Gabby. / This book is going to have a total of 13 chapters and I hope to finish it soon.