The primary weapon of parental control on Prime Video is the five-digit PIN. Choose one, this will allow you to prevent Junior from accessing certain content and features.
The first of these concerns purchase restrictions. On Prime Video, the catalog does not always clearly distinguish between content available for free and content available for purchase, rental, or through one of the paid thematic channels. Therefore, enable the PIN in Purchase Restrictions to prevent Junior from paying for one of these programs with your credit card.