A lot of parents of kids with type 1 diabetes do the ketogenic diet (very low to zero carbs). Apparently it keeps the blood sugar much more stable than what most people do with their kids (which is just to eat normal amounts of carbs, and then inject insulin).

You'd be doing the parents a huge favor if you told them about the keto diet with type 1 diabetes, because it's NOT mainstream, and requires research.

Here's a post from a type 1 diabetic: https://old.reddit.com/r/keto/comments/8g7sh4/type_1_diabetic_on_keto_this_must_be_illegal/