Do you think my house is haunted?

Well! I was in the kitchen heating up some pizza, minding my own buisness, when all of a sudden, I heard a door open. I was home alone, and thought it was the screen door (cause my sister never shuts it) so I went back there to check, and it was closed. Then, I went around my house and checked all my doors, but they were all shut. Know, I know your probably thinking something, but I know what a door opening sounds like. Then, me and my friend were playing around, and we decided to use her ghost radar things. So, it says I have two ghosts in my back office room at my house, but before it detected them, it said, "principal, teacher, fire" We got really freaked out, and told my mom, and she said not to worry because those things are fake, but I'm thinking not..and, my grandma has said that she has seen someone walk back in forth in front of our window of our house. The "ghost" had a top hat on, so we called him Abe. I've also seen an orbe type thing in my house before, but maybe I was paranoid because I was watching ghost videos. Now, do you think my house is haunted? Thanks in advance!!!