I agree, she looks medicated, with good reason. I get a feeling he is suffering from bipolar. People with this condition can be exceptionally brilliant. Him cooking dinner and shopping before he left indicates he was manic which can lead to an increase in risk taking behavior. They are also at an increased risk for suicide and can go days without sleeping. I get the feeling that the parents have kept a close eye on him for most of his life and guided him at every turn to negate some of the effects of this mental illness.