Your brother wants to bring a gun?  Will your brother inherit the family fortune if you die in the wilderness?  Reminds me of when I was a kid and my family tried to teach me how to swim by throwing me overboard in the middle of the lake (they weren't teaching me how to swim).
It's a good idea to bring a gun to protect yourself from the other guys you're camping with if you tend to get drunk in the evenings and everybody has a loaded pistol. You never know when someone might bump into you or disrespect you.