I believe my house to be haunted

[iRamenninja]

I can't stress enough that my parents don't believe in ghosts. My brother doesn't either. As for me and my sister that's a different story. I've never personally messed with anything other than the whole Bloody Mary ritual which wasn't even done at my house. As far as I know my sister has never messed with anything having to do with the paranormal. Ever since I was I around 6 or 7 random paranormal things have been happening. when I was about ten the paranormal happening stopped until about a year ago. i was walking past my old room to go outside and hang out with some of my friends. Out of the corner of my eye I saw a man standing in the doorway of my old bedroom. When I turned to look he was gone. At first I thought there was a robber in my house so I flipped the light on and searched the room but no one was there. A few weeks later I saw the same man sitting on my bed in my current room. I'm not entirely sure if this is the same entity that was in my house when I was younger, but whatever it is I feel threatened by it.