New house, not alone

My name is Kathy and I have some unexplainable events going on in my house. They run from objects disappearing from one place and showing up later in another place.  I get an overwhelming feeling that I am being watched all the time, even when I am by myself.  I have two children, a four year old girl and a 5 month old baby boy. I have noticed lately that my daughter says she sees a man in her room and talks to him all the time.  She calls him David, which was the name of my brother who died 11 months before I was born.  It gets cold in Annie's room and colder in her closet.  I dread going into her closet to get anything.  Just the other day I had someone knocking on the door and when I went to answer it, no one was there. I checked to make sure that it wasn't my daughter at the time because she was playing outside while her step dad worked on his truck.  She was up front the whole time, and no sooner had I shut the door then someone knocked on it again.  I answered it and no one was there.  Our garage light goes on and off by itself sometimes.  Well, that's about all for now.  I would appreciate any response that you might give to my problem.

This is  a new house and we are the first occupants in it.   I found a mysterious  bruise on my daughter's butt and on her back that wasn't caused by my  husband, myself, or any accident or fall.  On top of that I have found out that whatever it is here doesn't like me.  I  was asleep the other night with my baby when I sensed someone standing over  me, opened my eyes to see nothing there, but heard the words "Die, Bit** Die"  as clearly as having a regular conversation with someone.  The feeling of  malevolence is present everywhere I go in the house. (Somewhere near Indianapolis, IN)

Kathy B.