I found a touching blog post on a lovely blog, Dementia Days.
There is a video there, at http://www.dementiadays.com/2010/07/a-video-worth-watching/, of a lovely example of Validation Therapy, working with an advanced Alzheimer's patient. It was so touching.
Though my mother doesn't have Alzheimer's, it is a great example of respecting an elders' boundaries, while still using their 'vocabulary' and being present for their reactions, even when their apparent cognitive abilities have disappeared.
Beautiful. Please explore the other posts in the blog. It's lovely.