𝒎𝒊𝒏𝒖𝒕𝒊𝒂𝒆.

a literal child

Random person on the phone: we have your daughter

Tanjiro: i don't have a daughter...

Random person: then who just asked us for a cup of chocolate milk and to cut the crust off their sandwiches

Tanjiro: YOU HAVE NEZUKO