#cdmk

Headcanon that characters who know the Kudous, such as Megure, Kogoro, or Eri, have just pretty much assumed that Conan is obviously Yuusaku's illegitimate child. They're just all avoiding bringing it up because they're not sure who already knows, and don't want to accidentally cause drama by revealing it to someone who would be upset (and also because they don't actually have any proof, and it would be rude/awkward to ask for confirmation).