99% impossible today OP. I think you realize this already but in a last ditch effort you made a thread.

In truth, the only way to do it is to live away from society..perhaps in a mini tribe. If you're in suburbia USA, it's over. When the kid turns 10-12, they'll demand a phone. You'll stay strong at first and say no but will eventually cave in. Then the pron watching & social media hypnosis will arrive. They will zombifiy in from over your very eyes.