That is super rough... Things like this make me a bit scared of having a family, but wont let it stop me lol
Perhaps I can help you a bit in the 'understanding'. My sister was diagnosed T1D when she was 4, so i grew up with her as the only diabetic my whole life and we never really discussed it and i had no idea what she was going through.
I always figured she had 'an attitude problem' lol
Having mood swings, being irritable and moody a lot of the time - it never occured to me that it was related to blood sugars.
Fast forward 25 years and i was diagnosed as T1D and it suddenly made sense. The impact of being low and high, even mildly, take A LOT of focus and energy to tame.
Especially being high - when someone has high sugars (for me its anything about 7.5 i start to feel, and anything above 10 i might as well just be alone) they begin to feel just off. Its very hard to describe but for me its sort of a tingle / fuzzyness / foggyness in my brain and sort of a restlessness / annoyance throughout the rest of my body. In short, its mildly terrible, making any small annoyance just to much to handle without a lot of focus and energy. When they get too high a headache and neck tension form.
I mention highs mostly because people think "oh i would rather be high then low" but being out of the normal range really does impact your daily life and attitude, and really shapes peoples perception of you - especially if you are always moody and irritable..
I can't imagine dealing with this as a child, or a teenager, but as a mother and wife just know that if you find short tempers, or feel they are being irritable and short with you - its likely not you, and you shouldn't take it personal (but to be honest, its just a little you, they just dont have the energy or spare capacity to mask themselves and handle it properly - Imagine it like a big factory and suddenly alarms start going off and workers start running around and yelling - working hard to keep things in line - and you stroll in and grab someone by the arm who is running by and happily ask "Things look crazy - is everything ok?" lol Clearly they are not okay and you cant be angry if that worker bluntly says "No, are you kidding? what does it look like!" and runs off - the factory is a T1Ds mind and body when High/Low - so they don't INTEND to be mean they just have so much else to deal with but also did you need to ask THAT question at THAT moment? Just keep that factory imagery in mind and tailor your interaction based on how you think you should act that situation at that time lol)
/rant
Sorry for the length lol