His eyebrow raises, a single motion while his gaze now turns to bore through Watson, truly analyzing him in that second. It's the sort of look that belongs to those of the family Holmes who make it their habit and their preference to gauge whatever they can about a man from a single moment, alert and knowing, forcing attention. It's a very uncommon name, he knows, but...if someone is impersonating him, then he'd believe it. Certain enemies of his have that amount of cunning.

"I must say, this is the first time I've been accused of not being myself." There's a note of deliberate calm in his voice, keeping steady. "As to my brother, that is his name, though if you know him and he has been passing off someone else as his elder brother to cover his indiscretions, that is a matter I'll have to take up with him when I see him again."