No matter how much your kids love you there are still times when they will listen better to someone else say the same thing you are saying.  On of my favorite sources for that "other voice" are the Sesame Street characters.

Did you know that there are a number of free Sesame Street TV specials you can download for free in iTunes? They are under the name "Learn Along with Sesame".
http://itunes.apple.com/us/tv-season/learn-along-with-sesame/id215221061

These special episodes address topics such as dealing with grief, sickness, preparing for emergencies and healthy living.  My kids watch random episodes from time and we will sit down to watch specific ones together when I need the extra "Sesame" reinforcement!