Of course it's wrong of this parent to show up late for pick up. I understand it was after- hours that your hubby was napping, but if it were me I would have told him to nap somewhere else since you were still expecting a client. If she is just walking through the door unexpected, then that's not right either...definitely lock your door. I always do so that I'm never taken unawares. Maybe she wants to come in because she wants to feel as if she is a part of dcg's day. That's the vibe I've gotten from most parents like this.