If that brother really does exist, possibly yes, I would say. There's not a tremendous amount of judicial interpretation of the offence of personation, because it has not been charged very often. We do know that the person personated must be a real person, living or dead. We do know that there must be a real intention to pretend to be a specific person. If I invent a name that happens to correspond to a real person, I'm not committing personation. If I know something about the brother, and I know the people I'm talking to know the brother, and I say “I'm this guy who you've heard all about”, I would say I'm impersonating the brother.
On September 17th, 2009. See this statement in context.