Well, if he's defending them, Wrathion supposes it can't be that bad. The only member of his actual, blood family that he would defend these days is Ebyssian. And Ebyssian had earned that right.

"At least your circumstances have changed. But I suspect that you had a good deal to do with that yourself."

It's speculation, again. Wrathion certainly isn't the type to go crawling back anywhere, to anyone. (He tells himself this, but there's a very glaring gap in this thought process. It bears the name 'Anduin'.) There's also the simple fact that Bruno is in no ways near as prideful as the dragon is. (Though that is a very common draconic affliction...)