Also, she insists that we are not her "real" daughter-in-law, son, brother, etc., even though she has only one of each of us. Thiinks that we have moved her into another house "exactly like my other one". Is very argumentative and can't reason. She has some dementia as well as "Sundowner's". She has lived with us for nearly 3 years after cancer treatment, but this behavior was sudden and unexpected. Have you experienced abything like this?