Paper slide videos have been used in classrooms by teachers and students for several years. They started out being made with Flip Video Cameras, but they are easily made now with virtually any Smart phone video camera. Most of the places that tell how to make them are directed at teachers, but the same principles can be applied to Family History with Primary students, and siblings in a family.
Here are a few links to videos illustrating "how to make paper slide videos" made by and for teachers.
This describes what a paper slide video is, and is illustrated by the author's creation of one. What is a paperslide video? by Glenn Estacio
How to make a Paper Slide Video
Evolved Paperslide Vidoes by Dr. Lodge McCammon
Paper Slide Video - It is just that easy by Valley Prep Tech
A more elaborate paper slide video about the Appalachian Trail