There is a youtube channel associated with this web site. folkdancingforkids
Andrew Carnie has a youtube channel with hundreds of videos Tucson Folkdance
Rokdim has a 30 minute video stream of Israeli Childrens dances: https://youtu.be/ZhElEd7e8TI
Morristown NJ folkdance group has a large collection of dances on video: https://vimeo.com/user5573587/videos/sort:alphabetic
Dunav has a wide variety of videos, instructions and music downloads: http://dunav.org.il
Roy Butler has a number of accessable folk dances on his youtube channel: https://www.youtube.com/user/royisdancing
Danskantvzw has a lot of videos of dances that are accessible for kids. The site is in Dutch, the videos are still very accessible: https://www.youtube.com/channel/UC1aIuLt6D27vFjEn-2LfksQ