Unexplained scratches please help!?

We have been living in our house just over a year and had some unexplainable things happen. But now it seems to be getting physical and i'm freaked out! It started not long after we moved in I woke up twice to our front door wide open in the middle of the night. Doors you swore you shut would be open. my bf saw the kitchen light turn on. about 2am one morning I was sitting in the dining room and clear as day heard a loud whisper of my name come from by the hallway.I was so scared I went straight to my bedroom door and scanned the living room at that point the picture slideshow on out computer started getting fuzzy lines through them. More recently my boyfriend who BTW didnt believe in this type of thing, saw a shadow figure in the same spot I heard my name called. a few nights later heard footsteps across the carpet. Now the scratches only happen in our master bathroom. My boyfriend had a long cat like scratch down the back of his leg for no apparent reason just all of a sudden fealt the sting. We have a stand up shower and always shower together and I washed his back there was nothing. a minute or 2 later he says did you just scratch me. I was bewildered when he turned he had 5 needle thin, not bleeding scratches down his right side curving onto his back. The scratches are so thin its like a razor and they last a few days. But tonight Ive had enough. We have 4 kids and I was giving the 2 toddler aged girls a shower and I was standing right there when one said ouch I just got these red lines and they sting really bad. Sure as hell the same type scratches down her stomache. Keep in mind she has the shortest fingernails a person can have and she was facing me the whole time. i cant explain how they got there. and why is it just in our bathroom? I want to move right now!