[His only surviving sister, but he doesn't usually come forward with that statement terribly often. That she's his sister at all is more than enough, anyway, so he doesn't bring it up, only nods.]

[His expression stalls, and his whole posture tenses for a moment. He'd forgotten Konoha had met Giyuu and Shinobu... He closes his eyes.]

...Shinobu-san didn't make it. Giyuu-san lost his arm, [He waves his right hand absently.] ...he and Shinazugawa-san were the only pillars to survive. [It kills him that so many people so much more skilled who fought and suffered so much longer were lost. That even in dying, Muzan took so many.] Shinobu-san played a huge, irreplaceable role in Muzan's defeat, she and Tamayo-san developed the medicine we gave Nezuko. It's what... turned me back, and it's ultimately what made Muzan weak enough for us to defeat him.