Here are some sites for children to listen to that I believe are pretty good for children.
www.FBNRadio.com which has different children programs , just read the schedule on the web site for them and listen at appropriate times for them. And also
www.RangerBill.com which gives a story of a forest ranger in the west of the United States who helps people because of his faith in God and the Bible. All give good principles and character traits that children could use I believe. But as always check everthing out with the word of God , the Holy Bible, which should be the Christians rule for faith and practice at all times. These also can be listened to for free if you find the appropriate site that says listen. Sincerely; George