My Mom got dementia (she has passed on) and we watched her do some pretty weird things; like trying to pull out her teeth and clawing at light in the air as if there was a demon there that needed to be killed. It was rather horrifying at times.
Every once in a while it was as though the sun broke through the clouds and she smiled with delight at something and stayed in a happy mood for a while. She talked gibberish but it almost made sense as she pointed out the window at birds flying and other things she noticed. We had conversations that made sense to her. Sometimes she laughed. She remembered music and nodded along to very rhythmic nursery rhymes (she had been a teacher once).
In the end we had to unpack a whole lot of frustration and emotion, but what was left were those pure moments that transcended everything. Those were experienced in such a way I felt so connected to the essence of who she was and was grateful for the opportunity to get there with her. I also got to let go of all the resentment I had accumulated and nurtured without even realizing it. I blamed Mom for things that happened to me and she really didn't cause me grief on purpose. She was struggling through her own life and making mistakes as we all do.
I am hoping you will be left with the peace I was. 
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