Listen. I don't like you, and I sure as fuck know you don't like me much, either. But you know, tough shit, right? You can't just ignore [...] I care about your brother, a lot, and the fact he's upset now doesn't sit particularly well with me. I'm not asking for a ticker-tape parade, but at the very least you shouldn't push him aside on my account.
We just have to deal with each other. If you can be reasonable, I can't see why it can't work. If not, I'm preparing a pre-emptive "go fuck yourself"