Aw Emily I'm really sorry. It's so tough, it is. I felt like nothing would be the same ever again. I guess that's true too, but these days living with ds's condition is just the norm.
I have three others. Ds is my oldest son. He has a brother of 2.5, a brother of 5 and a sister of 9.
When DS came home on Christmas eve' 2005 (we just managed to convince the hospital to let him home for the big day!) his brother and sister slept on the floor with him. They wanted to be near him and they made a bed out of cushions. I don't think they've ever been so close before or since. It was very moving. He was so vulnerable.
They seem to have taken it in their stride. I've tried to make sure ds doesn't get too much special treatment. If he does (Say he needs some sweets as he's low for example) I just explain to them matter of factly that it's because of his diabetes. They understand it really well.
Again the family support weekend by D.UK really helped with this aspect. While we parents were sitting in lectures by various eminent diabetes specialists, the kids were hanging out and going on away days with the other diabetic kids and their siblings. They were talking about it all and writing stuff down - doing their own workshop stuff.
How are you doing? I assume your dd has a sibling or two? It's great you're asking about this because obviously you're aware they have needs too and this will be affecting them. The condition comes to live with the family.
I remember when I had a thread like this one when ds was newly diagnosed and a woman who'd had a sibling with diabetes came on to remind me to give attention to the other kids as they can feel resentful if the focus is always on the diabetic one.
Anyway this is a bit long and rambly. I know there's so much going on for you and I don't want to bombard you but I do want you to know I'm here and you can message me any time.
Best wishes.