Buttlight have you considered you might just be the victim of a couple of unhappy kids ? A few weeks you posted about some domestic problems you were having with your partner. Kids pick up on stuff like this, maybe they are unhappy with the home situation and want to get away and what better way to get away from the home and your partner than by convincing you that your home is possessed by demons?
When you have eliminated the impossible, whatever remains, however improbable, must be the truth. Arthur Conan Doyle