Turning Locks And Opening Doors

In my house there seems to be something obsessed with doors and locks. It all started on the back porch. The porch is enclosed and there are two doors that both lead outside. The first door (that we don't use) always seemed to open when it was definitely shut. I'll explain how everything would happen. We would walk past and the door would be shut. When we would go out sometime later, the door would be opened a little. It got to the point that my dad became so annoyed about it that he screwed it shut.

Now this event happened one night during summer 2012. My brother and I were the only ones up and he asked me if I would lock the front door. There are two locks, the one on the doorknob and a dead bolt. I locked the door and went back into my room to use my computer. A couple hours had passed and my brother came up to my door and said that he thought I locked the door. I said I did. But he got annoyed because the door wasn't locked. I got up to look and both locks were unlocked. I thought he had done it for some weird reason only he could understand. When I looked at him, though, he looked really annoyed that the doors weren't locked. I just thought whatever, maybe it was me and I had thought I locked them when I really didn't.

Later in the year, though, my dad was doing something outside and got locked out. Also, if your sitting in the living room you can hear someone playing with the locks. Of course, you go look and no one is there.

I have always thought there was something on both porches and outside in the yard (that's another story). I'm kind of afraid that whatever is playing with the locks and doors might be trying to let something in.

Any thoughts on this would be appreciated, and thanks for reading.