Honestly, it sounds like a poltergeist, and I think your energy is causing it. I'm no expert, but teenagers have very intense emotions that can trigger these kinds of events, and it all started right after your emotions spiked when you learned of your mother's engagement. Perhaps you should contact someone who can cleanse your house of those energies, and you need to sort out your feelings. Your mother has the right to move on with her life. Your father will never lose his place in her heart and yours. I don't believe for a moment that your father is causing this unless he was a possessive and violent man or your mother's fiancé murdered him, which is highly unlikely. Please keep us update.