I think it is some kind of supernatural event, but I don't really believe in ghosts so much as demons or spirits. Couldn't really tell you the difference either, there is no fact in the matter. It doesn't sound like the hauntings I'm used to anyway. They're often more violent rather than just spooky and irritating. It could be because your family isn't open to that side of spirituality. I would suggest you not try to communicate or provoke them in anyway, that could open up some doors better left closed. You probably already knew that though. There is no sure fire way of getting rid of whatever it is, if you're religious try whatever cleansing ritual they might perform in the belief. People's religious beliefs seem to have a power they don't fully realize. You would be surprised of the power people have just in believing. Then again, that could also provoke it. This also ties in to fear, don't be afraid of it, don't be frustrated with it, just let it be and ignore it. Probably the best way to go about it all.