Brother vs. brother is a pro wrestling staple. Whether it's real brothers or fake brothers, there is a long history of tag teams, factions and feuds all based on the familial connection between male siblings.
Tag teams trade off the natural connection brothers have. If you can't rely on your brother, who can you rely on? But guys getting along is boring. There's no tension. So, we crave rivalry. Competition. And a little deep-seeded resentment doesn't hurt the storyline, either.