Glad to hear your son is doing well. My 13 year old niece has diabetes. She was diagnosed on Christmas Day in 2001, she almost died, it was over 600. She got severe stomach pains and they took her to the local ER, who lifeflighted her to the Children's Hospital at the University of Pittsburgh. When they looked back, they realized they overlooked alot of symptoms (tiredness, thirst, a couple bed wetting incidents), so it was probably going on for awhile. It's great that your son has a team of experts, which my niece has too. No one in either family has diabetes, except for an uncle of my SIL's who got it when he was older.
Her 9 year old sister was tested and she has the gene too that may cause it. So she's in a clinical trial using insulin pills to see if it will delay the onset. They willn't find out until next month if she has been getting the insulin pills or a placebo. Meanwhile, she gets tested regularly.
At least at age 10, your son is aware of what's going on and can assist in his care. My niece just whips out her testing kit & checks it and gives herself the shot (with assistance for the dose).