Dasha Kiper has written a remarkable long piece about her year plus caring for a dementia patient. A shorter form was published as The deviousness of dementia while the longer version appeared as
Hope Is the Enemy: Caring for a patient suffering from dementia means coming to terms with the frustrating paradoxes of memory and language.
Links to both versions have been posted on Strong Brain in both
Alzheimers > Caregivers and Alzheimers > Coping Stories