From what I see and have read, you have treated diabetics and even live with one. It's NOT the same as being one.
Let me explain a bit. I'm a Type 1 diabetic who was diagnosed at the age of 7 in 1997. I had the same exact rules implemented at my school. I didn't care. I wanted to grab my lunch and eat with my friends. I didn't want to drink disgusting sugar-free drinks (still don't). I didn't want to stop playing at recess because my body was feeling "low". I didn't want to go to the nurse's office every day, 4x a day. I threw away my meters when they showed a high blood sugar. I avoided injections because they hurt. I skipped classes to avoid being present during an early release (3 month blood draw for A1c). This was not a life I chose and that was elementary school.
Middle school: I had more freedom and the same rules. I still avoided it. Boys I had crushes on didn't like me because they thought they'd catch diabetes from me. I had my friends and didn't want to be singled out.
High school: I hid soda bottles in my room. I bought snack cakes and juices before class. High BGs make us lethargic plus growing is tiring so I slept in every class until lunch. I had an insulin pump by then. I would eat my meal and forget to bolus. I got very sick. I still rebelled. I was depressed.
College: I would go weeks without checking and just give insulin. I'd lose weight. Had frequent UTIs and slow healing wounds. I had a boyfriend who I met in high school (he's now my husband) who saw me deteriorate. I couldn't stay in a dorm. I couldn't experience college the way I wanted to (not the partying or sleeping around portion). I was always too tired, too sick, or too depressed.
Nursing school: I found out about a diabetes program for adults which I'm going to again in May. When I walked into that building and saw 90 other Type 1s with the same illness it clicked for me. I was not alone. Nursing school didn't teach me about complications or treatment modalities for diabetic patients, but it did give me a different perspective.
Going to parents may work...temporarily. More often than not they will find ways around it. I did.
Tricks used by former and current non compliant (rebellious/depressed) diabetics:
-change date/time and check BG 20-30x making it look like they've been checking consistently throughout the week.
-checking their friend's BG "just for fun"
-I used my dog (I still can't believe I did that)
-write in different pen ink for the month
-Inject insulin after checking with another meter and using main meter to record only "good" BGs
-Drop of blood on counter. Let it sit. Use. Value drops about 30 pts while open to air (I don't know how but it did for me back in the day)
You got a long road ahead. Usually though, it gets better with age. Just DO NOT:
-take pt to dialysis center
-take child to funeral home
-ask child what color coffin they want (was done to me by my mother. I was 9)
-spank child when BG is elevated (done to me too)
-punish child for not coming in for BG checks
This was hard enough as a kid and a teen without adding puberty, peers, and the instinct to be "normal". Talk to them. Teach them about diabetes camps (I went to Camp Winona) for kids. They may feel ostracized. They aren't alone.