For me, working out (hard cardio like basketball or weight lifting) creates a ~24-hour window where I'm more insulin-sensitive. So I need less insulin for the same amount of carbs. When I do full contact sports like basketball, I remove my pump for the duration (up to about 2 hours) and then put it back on after. I check BG before I take it off and dose if needed, knowing that I tend to float downward as I work out, and I account for that. Sometimes I'll check during a break in the action if I'm feeling low, and I always keep a gatorade on hand to bring me up if needed. And I always check right after, and if I'm <100, I take gatorade or a carb to bring me up, because I know I'm floating down pretty hard in the few hours after working out. My endocrinologist and I have talked about setting a "temp basal" for overnight (I tend to work out at night) so that I take less insulin and don't go low at night, because I've had a few hypo episodes in the middle of the night, usually they wake me up, but they're scary.
Basically check before and after, and during if you feel "off." Keep insulin and carbs on hand to correct in either direction as needed. Know that you're going to have stronger BG swings than if you're inactive.
I don't know if your kid is driving yet, but if so, it's a solid habit to get them started to check their blood sugar before they drive, even if they think they're fine. I had a low-carb meal a few years ago, then went a worked out and didn't realize I was going low. I ended up blacking out behind the wheel and crashed, luckily no one was hurt other than totaling my car. I drove from downtown Austin to Cedar Park on MoPac, and I don't remember anything after going under 183 on N MoPac. I crashed at MoPac and 45.