Blondeshavemorefun - he was hiding behind the pillar and the door to the hall was the other side of the pillar, he would have had to crawl past them.
I'm not entirely sure why he went to so much trouble to go out the patio door quietly then make a big clatter in the kitchen so he heard them though! Or why Honey would give the kids to Archie and Janine. Both of them came into the show after she left so doesn't know either of them.