Rob Kardashian is, more or less, the black sheep of the family.
He hasn't appeared on "Keeping Up with the Kardashians" this season, and he generally seems out of the loop.
So maybe it's no huge surprise Rob didn't recognize Caitlyn Jenner when he first saw her Vanity Fair cover.
Kim Kardashian spoke to "Access Hollywood" about Rob's initial ignorance.
I think having her own stepson not recognize her really speaks to her magnificent transition.
Or maybe people should tell Rob more stuff.
Citations: Rob Kardashian Didnt Recognize Caitlyn Jenner on the Cover of Vanity Fair (TIME)