[ He straightens himself out and unsheathes the small weapon, revealing the blade inside. ]

It is... a kind of weapon the warriors in this region use, that one gave me as thanks many years ago. It is most akin to a knife.

[ He closes his eyes, thinking. A mere knife isn't going to be enough though, so he has to think of something more to do with it ]

...Osomatsu. I need you to do something for me.

Please rephrase your request as a wish to save your father and brother, so I may fulfill it.