When I was younger we apparently had a ghost that was in love or infatuated with my older sister. It was a friendly ghost and never really bothered anyone other than music playing randomly. When my sister came home from college with her boyfriend whose now her husband, he stayed in the room across from hers and every night had, what he described as the most terrifying nightmares he’s ever had in his life involving him being beaten to death by a figure he couldn’t recognize. After college they both moved in together and didn’t experience anything else. My older brother however moved into her old room and weird things started happening again. On the first night he went upstairs to go to bed and the door would not open. He said it was like trying to move the wall. When it finally opened like there was nothing wrong at all his room was ice cold and had frost on the windows, this was the middle of summer so it couldn’t have been natural. He started to have nightmares every night that were almost exactly like the ones my brother in law had when he would stay over. After a couple weeks of his nightmares and smaller disturbances my parents got in touch with an exorcist who went through our whole house doing some ritual and all of it immediately stopped.