On a related note, this is the second instance I've had excessive conversations with another brony on the Internet, and in both cases the person I was talking to turned out to be from Ontario.
If you don't mind me asking, and disregarding the rules, how old are you and your brother? If you don't want to say, that's understandable. I'm just curious about the brony demographics.
My brother is 27, so I don't think he'd be all that open minded towards the show. That's great your brother is into it at his age, but he's likely to call it...expletives, once he hits ~13 when everyone tries so hard to fit in. Hopefully that doesn't happen, because I'm sure it's nice to have close bronies.