On the episode where peter becomes blind something contradicts his blindness. In the scene where hes climbing into bed with chris, when he's asking chris questions to change the subject, he asks "Done all your homework?" Chris nods and peter carries on. How could peter possibly know he nodded?
When you lose one sense, your other senses are heightened, in Peter's case, when he lost his sight, he is able to hear and/or feel better, so he can hear or feel the rustling or movement of Chris' head on the pillow, when noticing this response, Peter knows that Chris responded, therefore Peter knows he can carry on with the conversation, Peter doesn't exactly have to see Chris' head move in order to know he nodded
No, you are being WAY too technical about it. I highly doubt the "sophistication" of Family Guy goes along with your logic.
He was just still asking questions. He wasn't done talking. It is as simple as that.