Is it damaging to the Alzheimer's patient when their delusions are just a dream?

It's difficult, but you mustn't argue with them. It is too stressful for their already confused mind. This is a new reality you must adapt to. You can do it. Use your imagination. You know what is real, simply show concern for your Father and comfort him. Let him know he is safe and loved. Right now, it is very simple. It will get more complicated. Take one day at a time. Mom needs to learn to accept it, too. Please do not make him feel bad, do not get impatient with him. Shift your thinking and read articles how to cope with this disease. Educate yourself and be compassionate. All the best to your family, Dear One. Hugs, Christina