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OP here
Update
My stepfather decided to approach my little brother about this. He told my mother that "this kind of thing has to be between parents and children, and not ask anybody else".
He then told my little brother that he saw "an article" about sites using kid's stuff like Pokemon and Digimon to lure kids to see things that they are not meant to look. He said that this kind of thing (not specified) can only be seem when you are 18+ , and bow that my little brother is warned he is going to have a punishment if he ever finds out that my little brother is seem this kind of stuff, like never being able to use internet unsupervised.
Little bro just nonchalantly said that this kind of stuff pop up on Google images.
Sooooo do you think it was a good approach?