I'm sending get-well wishes to your dad and hope-you-can-cope wishes to you! It's good to keep your dad off the road -- and use caution when anyone is in the car while he is driving until he starts using his medication. One of the things people miss most when they are ill is having a sense of control. So, maybe there's a way to give him a sense of control in managing the diabetes (e.g., he's in charge of his body, not the diabetes).