I wonder if any of your children do this - my DS9 hands do not seem to be connected to his brain. He is often unaware that his hands are picking at, breaking, touching things when he daydreaming about something or talking to someone. It is if they have a control center of it's own. Tonight the raw onions in the salsa I made were particularly strong so I picked them out for him. Whilst he watched me doing this, a second later as he was talking to me, he reached out and grabbed a mouthful to put in his mouth instead of the broccoli. It's so strange!