One day when I was more bummed than usual, I decided to go to see him and just hold his hand and think of the days when things were so much different. I sat down next to my dad and took hold of his hand and looked down at the floor and thought about my days as a child when my Dad was larger than life itself. He squeezed my hand and said "What's the matter Michael, Where have you been? I've missed you" I never felt closer to my Dad in all my life, and from that point on, I didn't say a word to him, I just held his hand and he knew I was there.
Alzheimer's is tough to witness, but I found it was best not to challenge him, I found it was best to ignore my needs and focus on re-assuring my Dad that I was there to comfort him, even to the point of pretending I was just a servant assigned to grant his every wish.
I hope my words will help you deal with your fathers condition, and possibly get you to focus on all the good times you had with your father and focus on his needs and be strong for him and your family.
I will keep you in my prayers my friend, and I know exactly what you must be going through
God Bless You,
Mike
God bless you!