My brother and I get along great. He's three years younger than me and has mental disabilities (he can function, but not on his own). We used to tell each other stories and build stuff together as kids; we were both the creative, quiet types. We still look after each other as adults.
My mother did NOT believe in making us compete for her affection or encourage any rivalry by comparing behavior. She made sure that we knew that no matter what happens in life, we'll always have each other and to look out for each other.
A lot of people tell me that we're freaks for getting along so well and ask if there's incest involved - which I think is trashy of them to even THINK of such a thing. I mean, geez, what sort of freaks are THEY to think that siblings either have to hate each other's guts or ... that? Ick.