If You Had A Brother In Same Division Would You Fight Him?

The Klitschko brothers have said before that they would never fight each other, which is fair enough. I was thinking though would I fight my brother (he's 1 and a half years younger) if we were boxers at the top of the same division! I think I would, especially if he was ranked 1 spot higher than me and had more belts. I would want to prove I was the best. A couple of my friends agreed with me but a couple said they could never fight someone in their family. My question is if you have or just imagine you do have a brother and your boxers at the top of a weight division, would you fight him? It's a fight the whole boxing world would love to see so you'll both make good money but it would be hard for your own family to watch! Disclaimer: Although this question was inspired by the Klitschko's situation it is in no way a hate/bashing thread on them. I understand why they won't fight each other and respect their decision!