Advice on 12M “sneaking” sugar at foods and drinks

My godson is 12 and diabetic, and lately, he’s been sneaking foods and drinks, raising his sugar to 400+. He’s been to the hospital 3 times in the last 2 months because of this, and will lie until pushed for the truth. He’s also been stealing these items.

A little background: His mother is currently hospitalized due to lack of oxygen to the brain (she is also on dialysis for kidney failure). He and his 16F sister are staying with their aunt, but in the care of their grandmother. They are not in school, and sister is being forced to care and watch her brother.

I’m really looking for advice on what we can do. The hospital has threatened CPS if he has another hospital stay.