Nope, I generally just plagiarize the last film or piece of fiction I've read. Sooner or later I'll probably end up traumatizing a niece because the last film I saw was by Lars Von Trier. As for life lessons, the typical stuff you teach children of that age group - younger kids need to learn empathy, self control etc. Older ones can be introduced to basic social commentary - sometimes people have to be mean to be nice, sometimes people get sick and go away, but this is nobodies fault, sometimes your imagination is unreliable etc.