So is Sabretooth (the guy who looked like a lion in the first Xmen film) really Wolverine's brother like it says in Xmen Origins: Wolverine, or did they just make that story up for the sake of the film?
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Pretty sure that was made up for the film. Sabretooth is meant to be a sort of shadow archetype for Logan, but they're not related. (And, at first, they weren't connected at all and appeared in completely different comics).