Board Thread:Questions and Answers/@comment-473553-20130605151715/@comment-4622366-20140708034737

Spencerz, like the big one where Cain Marko aka Juggernaut went from being Charles Xavier's foster-brother (no blood relation; his father married Xavier's mother after Xavier's father died) to being his half-brother.

Or how the Genoshan Genegineer's son went from being a mutant molded into one of those mutate suits to being a non-mutant.

The first one is the one that bugs me the most; the mistake has been repeated so many times it seems like most of the current X-writers have bought into it.