I agree with everything that everyone else wrote.
Here’s my strategy for dealing with other people’s medical problems. I identify (sometimes its as easy as asking and sometimes you don’t even need to ask) what is more likely to motivate them taking care of themselves. Your gonna have to play to that motivation. I WARN YOU, sometimes these appeals are not as effective when they come from individuals within the family. My success rate is much higher appealing to individuals outside my family.
There are people who are primarily motivated by their own interests - They might not want to deal with the hassle of diabetes, or they might not want to get into any trouble, or pay the $ to go to the hospital, etc.
There are also people who are better motivated by appealing to them about the effect of their illness on others. For example, “Mom was really scared the other night,” or “The effects of diabetes are putting unbearable burden on the family.”
If your going to make an appeal for a change in behavior or A1c or technology or anything, know walking in what will primarily motivate him better - his own interests or the desire not to be a burden on others. Often, you end up touching on both.
Do you feel like you could have a diabetic to diabetic chat with him? You are rather experienced at talking to diabetics. I might call this a ‘specialty’ of yours and I feel like you could make some ground here. My best friend taught me that it is always better to start a conversation like this by talking about yourself. You open up and say, “I feel like I would feel more secure if I had a family emergency plan for what to do if I am hospitalized. This is a list of all my medications and dosages - I want everyone to have a copy.” Then, see where that goes. Let him think about you and your relationship with your illness. That will spark him thinking about his own.
God bless you, Brad. This is a tough one.