My mom has Alzheimers too and I took care of her for 2 years before placing her in an ALF.
Anyway, this was the first lesson I had to learn. They call it "speaking Alzheimers".
One time, and this was when I realized she was slipping into the next stage, I came home from work and she was just rounding the corner with 2 big shopping bags from the corner store. Both bags were filled with half gallon containers of ice icream.
Now, you have to understand my mom and I shared a two family house. She was upstairs, I was downstairs and the only other living beings were her cat and my dog.
I asked her why she bought so much ice cream and her answer was "It is for the kids". I just humored her and I knew what was going to happen...
After about 10 minutes she was banging on my door wanting to know if "the kids" were down here
That's when I hired a daytime care giver!
Oh gosh, the stories!