I hear your concern and con understand for what you may be feeling about caring for your son. Believe it or not, you your partner and your son will survive and diabetes management will just become a part of his life. Certainly you will need to help him develop a “healthy” lifestyle especially in getting sufficient exercise [can you actually slow down an 11 y/o?] and choosing his foods wisely; who knows, but by helping him your whole family may benefit.
There are many good tools available to assist him and you manage, tons of good information and many people with T1 experience ready to share what they have learned - success stories. For some reason, I’ve worked myself into 60 years learning how to live fully with diabetes and not let anything keep me back; all done without the great tools such as BG meters - in my early T1 years a blood sugar test took two days to get results.
Here is a link to a page from Diabetes Forecast Magazine Tried and True" tips for parents of children with diabetes. http://www.diabetesforecast.org/2012/jun/for-parents-tried-and-true-diabetes-care-tips.html
Good luck to you, your learning curve will be long- I’m still learning - stay in touch,