I suspect that Bret Stiles has a son who is Red John. I find it hard to believe that Stiles doesn't know the identity of RJ seeing that he has given Jane info on where to find Christina Frye after RJ took her. Seeing that RJ kills (or has killed) anyone who has been compromised. That fact that Stiles is still alive means that he is trusted by RJ. A young inexperienced killer at the barn on the farm that Visualize operated points to a member of visualize and Stiles doesn't seem like a man who leaves loose ends so he is protecting RJ which means that RJ has to be especially important to him.. like a son would be.
