My sister was diagnosed type 1 when she was 17, she's 47 now and doing OK. She's been on an insulin pump for a long time. I've been type 2 for about 6 months now. It does take management and paying attention but it can be controlled.
Get him and you into a diabetic teaching class, I found it helpful to learn why diabetes is about more than just the blood sugar levels.
Good luck hunting,
Homeowner to trick or treaters: "What do we have here, a horde of mindless zombies?" "Close, we're the mainstream media!"