TB leads a double life.
At home, church, and school, TB goes by his given name. This TB, although far from mild-mannered, focuses on more cerebral pursuits, and of course, agitating his sister.
At camp and sports commitments, however, TB goes by his initials. This TB is a lean mean competition machine.
The biggest secret of all is why TB pretends like he doesn’t switch between alter egos as it suits him.