I have always recommended the amazing book, "Why Did Grandma Leave Her Underwear In The Refrigerator" by Dr. Max Wallack as the perfect explanation about Alzheimer's disease for kids. One of the greatest moments was when the book was read by a NEW ENGLAND PATRIOT and honored by the New England Patriots Foundation!
The book written by Dr. Max Wallack, is about MY life with my grandma, and his life with his great grandma.
Even though the subject matter is a sad and hard, it is still an uplifting book filled with easy to understand explanations and hope!
(A portion of the proceeds go to the Cure Alzheimer's Fund)