Flip the situation and talk to his sister first.
"Hey, I think I like your brother, but I want to see if you'd be OK with me telling him."
If he's on your mind 99.9% of the time, his sister definitely knows you like him
At some point, shy people work out how to have shy babies.
I look forward to hearing about your first date.
Which will happen because he likes you too.
I assume you don't live in Australia, so I'm safe from your newspaper.
But I'm safe anyway because he likes you back.
*risk of getting hit with newspaper rises*
>>> I love living in the usa, no risk of newsp...
Yes, luckily there are no risks of getting harmed by anything in the USA...
OK, this is starting to get Foot-scary...
Inner West or Outer West?
OK... western suburbs... goes to church... mmmm... Caroline Springs?
>>> The dog is gonna go church to church to fi...
"Sorry for interrupting the service. Someone here is in love with their best friend's brother. I have no further details to add."
(At this point I feel the need to clarify that I have zero intention of finding you or your church)
(I'm just working my way along the Vline route at this point)
We'll just say that if you did indeed want to find me to hit me with a newspaper, I'd be within comfortable driving distance.