Well... Maybe you could, and put your childhood friend and brother together somewhere safe in your home? That way, maybe it can feel kind of like the three of you would be together?

[ Zenitsu wishes he can find his other friends, not just Tanjiro and the other Pillars' dolls, so he can pretend they're all one happy family. There's also a part of him who wished that his teacher and Kaigaku had shown up here at least once so their dolls may be present too.

...Maybe that was a little creepy. ]

Sorry, please forget what I said.