My 3 brothers push back on the diagnosis & refuse to educate themselves about Alzheimer’s. I worked w/Alzheimer’s clients in the Alzheimer’s memory unit of a retired community setting yet they don’t want to accept my knowledge of the disease or learn for themselves. I've told my siblings that we could all meet w/the neurologist who performed the full neuro psych testing & subsequently diagnosed Dad, but they ‘don’t have the time’.
Good luck Debra, thank God he has you!
In addition, the wife normally just lets it roll, after all they are boys, most all caretaking falls on the women.
This disease shows no mercy, eventually they will have no choice they will be forced into opening their eyes, then they will tell you how to handle the situation.
Be prepared the day will come!