What do Karen and Tsukihi see Ononoki as? They told Araragi he would never grow up since he was still talking to a doll (Ononoki) at his age in Tsukimonogatari episode 4, 31 minutes in. It's always hard to tell how different people perceive the same phenomenon in Monogatari series, which is fun and puzzling.

What do Karen and Tsukihi see Ononoki as? Do they not perceive Ononoki as a human being?
If I recall, they won her at the Arcade, so they see her as a simple won prize doll.