I wrote this some time ago but I will suggest it again in case it helps you.
I told my husband that if he gets in a car accident, his fault or not, we will not be able to afford the outcome if they find out he was driving while knowing he was diagnosed with Alzheimer’s. I brought it up at an appointment with his neurologist and his neurologist was very firm on not driving (and said in our state there is a law in place for not driving with this diagnosis).

Call your insurance company and ask them if they will cover him driving knowing that he has an Alzheimer’s diagnosis.