a coupe of weeks ago, my whole family was sitting down for dinner. My son (four years old) suddenly says "dad who is in the hallway". Everyone was at the table. We thought it was odd but my wife and I just let it go. Yesterday, my wife calls me at work to tell me that my son just saw someone walk into our bedroom. He is absolutely sure he saw someone. My dog has acted strange also in the same part of the house, like he was reacting to someone. This house is relatively new and we are the first owners. Do kids and dogs see things we can't?