I have a kid brother, he watches phone for hours, and we don't even know what he does on that phone, my parents don't really put much thought into it, but I wanna make sure he is in right path, so I tried blocking 18+ sites (p*rn, illegal gambling sites, trading sites etc) through tp-link's website parental control -> Blocked Content, but it didn't work, seemed like the keywords i have put didn't mean a thing, I don't even know if this blocking system works, so if anyone knows how to do it properly or if it even works, please help me out!

best regards,
Big brother.