You can be charged with anything the police have probable cause to believe that you did. Whether they have probable cause often depends on whose side of the story they believe. The way you explain it, it sounds like you used a reasonable amount of force in self-defense, but that doesn't mean you can't be charged if they don't believe you. If there is any possibility that your brother contacted to police first, I would strongly suggest you contact an attorney.
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You can be charged. It just depends who the police believe. It's often a race to call the cops. I would report the offense if you haven't already.
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Charged, yes. Convicted, maybe.
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