Castiel. Now that's an unfamiliar title. Which just makes Nick's own name that much more unorthodox in comparison; if his father was apparently plumbing the more obscure Judeo-Christian reference books (Daniel's never even heard of Castiel - a variation of Cassiel, maybe? But that's not even biblical, those are different origins entirely), why would he settle for 'Nicholas'?

In any case, it sounds like Nick's familial politics are something of a Gordian knot, and Daniel has extremely limited context.

"So, uh, how big, exactly, is your family?" he asks lightly, fully aware that Nick hasn't actually given him a concrete number.