OMG! I just started to reread CoS and I noticed something. We all know that Ginny is Ron's sister, or not.
It's been stressed that Ginny is the only female Weasley in generations. She might be Harry's sister because of the genetic traits and other things.
Ginny has red hair like Lily and hazel eyes like James. This may sound kind of strange but it just seems to make sense. Lily and James died on October 31, 1981, and Ginny was born before that otherwise she wouldn't be 1 year behind Harry.
Also, Voldemort took control of Ginny in CoS. Maybe he knew she was the second child of James and Lily Potter. Otherwise, he would have taken control of Hermione. Harry barely knew Ginny in his second year. He knew Hermione better and Voldemort knew that. So why Ginny?
So what do you all think? It sounds strange. Really strange. But it might be it.
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