Tamba's so-called "cunning little tricks" are nothing to Tetsu. Often, as soon as he starts them, Tetsu sees right through him with a smile.
If the Little Demon Princess were bold enough to think of pulling pranks on this big brother, attempting to "challenge authority"...
The result usually ends up being the same — she gets "tricked" or "taught" in return, without him even batting an eye.
Tetsu's methods might not be harsh, but they're definitely "memorable," often more so than being directly caught by sister Hoshimai!
As it's said, Tetsu seems to enjoy when the little demons at home try to outsmart him, but unfortunately, even clever Tamba has failed time and again... Tetsu has become the "intellectual pinnacle" in the Kamiya family, whom none of the younger siblings dare challenge.
Then there's sister Rin...
If Hoshimai disciplines someone, she can be strict, but at least she's measured, aiming to correct rather than punish.
