I've seen suspects blame their minor children for the CP on their computers. For an affirmative defense, you usually have to try to provide facts for it. But the defense lawyers entire goal is to get "it was his brother" into the jury member's minds. Even if the prosecutor objects, it's still out there. And even if they blame J boy X, its not like they go and arrest that boy.
JB is in a lose lose situation. If Josh pleads, then he is admitting guilt and JB looks like a bad Christian and parent. If they go to trial, everyone will know what Josh was looking at and they look l