They made their own choice. They chose family.

And it works. Castiel doesn't feel as if he's making a decision, though that's exactly what he does as he nods affirmative. The plan sounds good to him. Very logical, very simple, and very clear. He can handle those structures right now, and he's more than glad that Sam is giving him a red thread to follow, even if he doesn't realize that it was his own choice to pick up that thread.

"Coffee makes me feel less sluggish", he admits.