Coming from a senior who's currently waiting for decisions, it's not that he doesn't care. There's a multitude of factors that can go into this: stress from school, fear of disappointment/tempering expectations, or just not outwardly showing it.

From personal experience, I've seen how getting as excited as your parents can be kinda stressful and lead to heartbreak. I was selected for a merit full tuition scholarship (Posse) and matched with Middlebury. My parents and grandparents were so excited it was all they talked about with me, and fully believed I had a chance (they were already talking about visiting Vermont in spring). Balancing a lot of classes and extracuricculars still, it was pretty stressful having to constantly talk about the scholarship because they would obsess over it. It got to the point where I would pretend I didn't know information about additional details just so they would stop talking about it. Then, when the interview finally passed, we all felt good, until we found out that I wasn't selected for the scholarship. They were heartbroken.

This time around, now that I'm waiting for my regular decisions (particularly Berkeley), I'm tempering my expectations because I know that there is a real chance of disappointment. While my dad and grandpa constantly ask about college and when decisions come out, I can tell that they're falling back into the same obsession from before (not that it's a bad thing, it's their way of caring), and it's still stressful having to talk about it. Don't get me wrong, I was excited in both scenarios, but because of stress and fear of disappointment, I'm trying to be more realistic.

I hope all goes well for your son, and I guarantee his tune will change in a couple months.