You may find the newest and award winning documentary, Vulnerable Innocence - The Internet - Are Children in Charge, helpful for the father to watch, perhaps also his son can watch it with him. It covers content on the dark web, pornography, and predators. It is streaming on Prime - https://www.amazon.com/Vulnera...orvath/dp/B0B8NRKVRY
Director and Writer, Charlene Doak-Gebauer has a LinkedIn page. You may want to connect and message her for more advice, as she is an expert in this field, and just an outstanding person.