I know that many children/ families are fans of the audio based
Adventures in Odyssey.
There are many web-based audio shows. There is a huge list I found, but some are soapoperas that are geared for adults so I won't put that list here. However, I will post the ones geared for children and add to the list as I find more.
http://imaginationlane.net/shows.html
Here is their list on story guidelines:
"Family Friendly / Clean Feed
These need to be released on a clean feed and be safe for the entire family as well as conservatives. This means:
- No swearing (not even OMGs)
- No mature situations / sexual references
- No detailed graphic violence "
This is a volunteer based audio drama. I would personally say that it is geared for "middle school" age children on up with parents, I listened to one of the stories in the Imagination Backroads series which was very well done.
Here is a children's radio link site many of which are Christian based:
http://radiotime.com/genre/c_227/Children.aspx