I am so sorry to hear about Aunt Pat's episodes. It's very difficult to say what is causing them, to be perfectly frank. Even a neurologist might only be able to say it's probably dementia-related. There is so much about the human brain we just don't understand. It's quite possible that Aunt Pat is dreaming and just can't tell the difference between dreaming and reality anymore. I can imagine that line being easily blurred if you are older, your energy much less, your body including your mind not working as well as it used to, etc. I can also imagine how painful it is to watch someone you love go through that. I hope Delphine does go ahead and gets married, that she is able to share these concerns with her husband-to-be, and that he can be a blessing to her in this difficult time...