'Just blow off the candles! Oh, how the tables they turn!'
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When Lily and James Potter survived after Voldemort tried to kill them, they raised their four children, Camellia, Harry, Ivy, and Daniel. In a house full of Gryffindors, obviously a Slytherin wouldn't be possible, would it?
Camellia Potter was Harry Potter's twin sister, but she wasn't the girl who lived, after all the prophecy spoke of a boy, not a girl, so she wasn't there when Harry defeated the Dark Lord, she had stayed somewhere else far away from trouble.
But this story isn't at all about that, it's about how different things could've been if James and Lily survived. How different things would've been if Harry had a twin, or better, even more siblings.
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Characters apart from non-canon belong to JK Rolling. Mattheo Riddle belongs to Yasmine Amara, from Possessive.