I want to have a relationship with my brother, is that okay?

Biological brothers who are related by blood are naturally not allowed. This involves ethical issues, unless you are willing to endure secular prejudice, be criticized by thousands of people, and cannot get married or have children. If you are just talking about "a" love, I think it will only increase your worries. You might as well find someone else to talk about it. If you are a cousin, you can get married in some countries. If you want results, decide to immigrate. But no matter what, this is a very complicated matter. If you don't want to be so complicated, it's better to fall in love with an ordinary person.