Two more Family Advent Duides of note:
Lifeway has a free family advent guide with one reading/activity for each of the four weeks of Advent. The new in '22 guide includes patterns for cutouts so that families can build a manger scene.
Illustrated Ministries has download kit titled, An Illustrated Advent for Families: Do Not Be Afraid. The printable PDFs can be shared with your families each week during the Advent season to be intentional and focus on their faith. These weekly reflections explore the theme, "Do Not Be Afraid," which is found in Jesus’ birth story in the Gospel of Luke. This isn't free but it can be purchased for your entire church at a reasonable price.
Screenshot of one of the PDFs which children can color and assemble: