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Dear Lonely Ghost,
That is legitimately horrific, and I honestly do not feel qualified to dispense advice relating to your inquiry. I’m happy to post this on the tumblr on the off-chance that your elderly mother is among our followers. However, even if she is, there’s a strong likelihood that she cannot read “mirror” English. In fact, many elderly people struggle to read anything at all due to their deteriorating eyesight. Have you come into contact with any realtors or house-flippers? Often, their economic interest in the property will encourage them to appease any ghosts that may come with it. In the meantime, I’d consider seeking psychological assistance from qualified professionals.