My sibling is diagnosed bipolar and BPD. I've been home from grad school on winter break, and I forgot how much he will talk...and talk...and talk. Pretty exclusively about himself, and almost always going on and on about all the ways he's been wronged in the past. I just feel like he's always ranting? It got worse after he hit puberty. Is this normal? Is there some way to break his circle of anger so he stops ramping himself up into bad moods?

Barring that, is there a way to get him to stop talking at me without triggering his rage?