Big Brother, One's Senior
The older brother is valuable to you. But, no matter how valuable he is to you, he's still just your older brother.
P.S. You'll often see some gangstah thug call a higher ranking gangstah thug (one that acts like an older brother to all the other gangstah thugs) this. It's like family within the gang.
The reading is 兄 on its own plus the reading for 貴. ANIKIIIII.
Your older brother is a really cool guy, but mine is not.