Witnessing the gradual decline of a loved one is heart-breaking. Taking care of a person or persons suffering from either Dementia or Alzheimer's is a challenge. Three publications that touched my soul, two I would recommend for gaining better understandiong include:
Keeper: One House, Three Generations, and a Journey into Alzheimer's by Andrea Gillies
Still Alice by Lisa Genova
Dealing with dementia by Homa Khaleeli [Download Dealing with Dementia] in the Mail & Guardian 18 to 24 November 2011, Health insert.