Sirius is your godfather, and you were staying over at the Grimmauld with the Weasleys and your older brother, Harry. Harry was only a minute older than you, you were his twin sister.

One day, before going back to Hogwarts, Sirius shows you a picture "This.. Was from when we were.. 15.. We took a picture together.. That guy with jet black hair is your father.. The one beside him is obviously me, and the one behind is Remus.." Sirius points out

You noticed they all were very handsome and your jaw drops to a shocking length.

(BTW I got this from the book so it may not be the same as the moviesss!)