Maybe this book? One of the reviewers gave it 5 stars. I don't have personal experience with it. amazon.com/Mysterious-Illness-Myasthenia-Gravis-Hazel-Smart/dp/1425924107/

Sadly I think most friends & family won't take the time to read a book. Not if they aren't used to reading non-fiction books fairly regularly. So an article might be better, sometimes they are too lazy for that even.