Here’s the story about young Evan: http://www.theglobeandmail.com/news/british-columbia/boys-911-call-saves-grandfather/article4801732/
Here’s a quick 911 cheat sheet you can build a class around :http://www.onsitefirstaid.ca/resources/onsite_quickguide_kids_cheatsheet.pdf
A quick resource to what to tell them, and how to teach it: http://www.pediatricsafety.net/2010/07/the-importance-of-teaching-kids-to-use-911/