My parents just told my friends' parents not to treat me to food, but also not to take away my candy, but I was two years older than your child when I started having diabetes. It's probably terribly scary to let your child go, but you can start with a little time when nothing will happen to the child and gradually increase the time that he can be without you. In any case, you can give your child a phone (cheap phone, which is not a pity to break) and call him periodically
I have never tried to transfer my cgm data to another person, but as far as I know LibreLinkUp allows you to do this