(This series is not very long, and I would highly, highly recommend watching all these videos with your children and discussing them. This one was made for children.)

Signs of Grace - You Are Forgiven
These You Are Forgiven videos are just a small portion of the curriculum created by the trusted theologians and award-winning film studio at the Augustine Institute. Signs of Grace is the only comprehensive sacramental preparation program for children that includes a thorough family faith formation component.
https://watch.formed.org/you-are-forgiven-1

Please watch these brief YouTube videos and discuss them with your children, too

YouTube - How do I go to Confession?
https://youtu.be/Ib8pzvnnL20?si=u3rSdIWoJhpi1fyO

YouTube - A Kid's Guide To The Sacrament Of Penance
https://youtu.be/NHSFUlf3fkc?si=5NocTQRUj5CNVHFX

YouTube - Sophia Sketchpad: Confession
https://youtu.be/CDyMHg8HkSE?si=fWfM2ficSHxb_JAx
(This is a good video, but there is a very brief reference to drug use from 5:35 - 5:40. I would recommend skipping these 5 seconds of the video if you want to)

YouTube - Practice First Confession
https://youtu.be/pvZSgRKnOkg?si=G8u9ECcH3-njaQHH
(If they are curious what confession looks like, here is something that fairly accurately displays what Confession looks like)

(Another series on Confession - aimed more at adults, but it would still be beneficial)
Forgiven: The Transforming Power of Confession
Forgiven: The Transforming Power of Confession, explores the grace and healing offered in Confession and shows how this sacrament of mercy reveals the depth and bounty of God's love. By looking at God's revelation of his mercy in Scripture and making a step-by-step examination of the Rite itself, Forgiven communicates God's invitation to each one of us to come experience his indescribable love in the Sacrament of Reconciliation.
https://watch.formed.org/forgiven