I'm a librarian who loves anime, manga, and reading a wide variety of genres.
For some reason all the siblings make me think of the House of Abrasax in Jupiter Ascending.
I still have no idea what's going on, and neither does Corwin, the protagonist. He has bluffed his way through everything in the book so far, keeping everything he says just vague enough that the people he's talking to fill in the blanks for themselves (and sometimes for him, giving him a little more information). It's been kind of fun, although I still don't buy that bit at the beginning, when the guy handed over a few hundred dollars for an "out-of-court settlement" and allowed Corwin to leave without any proof that the supposed settlement ever happened.