That's something they might find agreement on. Balthazar's trouble is that some of the humans (and other species) around are starting to feel as much like--or more like--family than his family does.

That's not something one can say to an archangel. Certainly not to Raphael, nor even to Gabriel, who has more basis for getting the concept. It's something he could doubtless talk to Castiel about, but probably what he'd hear in return would just hurt.

So, he'll nod and smile and tread the line a bit longer, until the inevitable crash and burn, which is likely to be ugly whichever way he falls. But for now he has a pat on the back from a big brother, and it's enough to keep going ahead with. He smiles, and steps into the dark.