One minute your son is laughing about farts and driving you mad because he can't sit still. The next minute he's grumpy and never wants to leave his room. Adolescence can seem to come in an instant, so how do you prepare for it and help your son survive and thrive? Maggie Dent talks to adolescent expert and former ER Doctor Arne Rubinstein about the positive influences that can help shape a boy's journey to manhood.