What I find interesting is that most of the times one brother far outshines the other or is simply that much better skill wise. Age doesn't necessarily seem to matter.
Alistair vs Valentin
Frank Shamrock vs Ken Shamrock
Rickson vs Royce
Nick vs Nate
Jim vs Dan
Clay vs Jason
Fedor vs Aleks
Lyoto vs Chinzo
Shogun vs Ninja
Still waiting for brothers or sisters who compete against each other inside the Octagon for the belt. I find that to be a very interesting predicament.
Marcus Aurelius: Tell me again, Maximus, why are we here?
Maximus: For the glory of the Empire, sire.
Baked, not fried... the healthy choice.