^ Not every kid behaves in exactly the same way to a situation. Some burst into tears at the drop of a hat, and others become almost numb to the outside world and need more time to process their emotions. Especially someone like Jeremy who's already lost one
parent, and is probably in a state of shock that he just lost another.
Of course it didn't help that the Jeremy actor wasn't all that good. You could see him really trying, but it just wasn't happening.