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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They arent really brothers, but their birthday is on the same day. They visit one another to fight each other on that day. There's a comic that focuses on their relationship. When I remember the name of the graphic novel, I'll let you know.