I agree with previous posts also, what little experience I do have with dementia (helping care for my grandmother,) I found tremendously hard.
I had so much baggage connected to her awful treatment of my mother, that I found it almost impossible to remove my bias from the situations where she was being rude and utterly vile, and remain impartial.

As much as she wanted to be home, she was bed ridden, the simple fact was that we all needed a break from time to time to ensure we did the best for her in the end.
My mum often ended her day in tears and I would be full of anger and venom.
I will admit it was a relief when she finally passed, and you have my up most admiration as I know that it is not a job I could do.
You can't take care of someone until out take care of yourself, that much I do know.
Take care.