This is the point where Kelly becomes aware that his progeny is standing approximately 3 inches away from him. Horrifically, at least from his perspective, he is informed by the BBC anchor.
Breaking Down the Father on BBC Being Interrupted by His Children
Ben Thompson

I actually think Prof Kelly realizes his kids are coming in himself, not because of the BBC anchor. See Prof Kelly look to the bottom left of his screen, presumably where the preview window may be to prob confirm the sounds he can hear are from his daughter now in the room.

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