You've sure lived in a few haunted houses.. I'd change my realestate agent if I were you. lol..
seriously though, I think you are a sensitive, perhaps because of so many events in your life.
I think if I were you and wanted to take a stab at communicating through the Ouija, I'd try to contact this boy called Mark. As a young spirit who already knows you, he'd probably answer your call strait up, unless he's already moved on or whatever it is they do. But don't be surpised if he doesn't answer, and someone else starts conveying info to your parter and not you.. That's what surpised me when I did it, the info didn't make sence to me, it was all memories of someone elses life, nicknames, events that meant nothing to me..
I never thought of Mark! I guess I don't really know enough about spirit guides to form an opinion, is that what you think he is or just a kid that thinks I'm cool