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So is he the third Summers brther or what? Is he Cyclops and Haoks brother?

Nope, Vulcan is the third summers brother. He is appearing currently in "X-Men: Deadly Genesis"

X-Men: The End is not in continuity so that story of him being a clone might not hold up.
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Sidenote you should check out your AF thread

this should go in the X-men forum.................

Or it will get closed.