Referring to the picture: WARNING GRAPHIC THOUGHTS AND QUESTIONS . . . . (please don't read if you will be offended by sexual content)!
1) The large figure (Dad) has hands that appear phallic, wearing a tie?, he is the only one in the picture with hands.
2) I agree with the poster who saw a dog vs. child on all fours or child sitting @ a desk, as it appears it could be the dog's tail drawn in darkly. What appears to be an erection on the large figure could also be a handle in the loop of the leash on the dog's leg(?). We would only be able to know what was meant by this child at this particular time would have been to ask him to "tell me more". What I found astounding is the placement of the loop in the dog's leash - either way . . .whether he meant to or not . . . it still comes out in child play and child drawing. I know one of the children wanted a dog (from the letters Josh wrote to the boys) . . . were there ever allegations of beastility on the porn found from both adults in the home?
3) The figure who is spread eagle laying away from the other two is ringed across the eye area. He is protecting all of his body (by playing dead?) except his eyes. He is peeking/watching/(voyeurism?) Somewhat reminiscent of Grandpa Steve?
4) Could this be what he drew when he was angry at the child at school?
5) Such a STRONG statement by a child! There were dark lines - (aggression?), emphasis (on the punctuation), X'ing out people, protection lines, very emotional child, lots of aggitation, he needs a healthy way to let out what he is feeling and learn to understand and name those emotions. He needed an adult to help him organize his feelings, not a Daddy who confused them even more.