He glanced sideways at him, almost curious and offers, "I assume they're both alive, well, and doing the utmost that they can do to cause chaos around the city."
Sherlock frowns, briefly thinking of his little brother. "And one is likely fawning over the other, as he seemed to be when I last heard." And he didn't care much for the finer details, but if it came up at holiday with the family when Sherrinford didn't show up... "I would like to know what you think I could tell the parents? Blissfully engaged? Perhaps a complicated and profound bond?"