I echo LD's sentiments that there needs to be more, lots, LOTS more!

“Dean – keep Sammy in sight.” Dean huffed, but didn’t argue, earning a hand that messed his hair from John when they got out of the car. The kid was slowly developing instincts about his surroundings.

This part is my favourite! I like how you write John, and I would enjoy reading more about how he sees life on the road with the young boys, and how he reads Sarah and John Connor.