Hey Stephanie! 
One thing I’ve had to work through is how to have a conversation as a family about caring for someone with dementia or Alzheimer’s. In the early days of my grandmothers diagnosis, her children had difficulty acknowledging that this was the new normal for their mother. In hindsight, denial and some outdated understandings of mental health probably contributed. Not in an unkind way but her sons would correct her, and got frustrated when she couldn’t remember things or was trying to mask that she couldn’t remember things. The shift for us came when someone said to my aunt that “it’s not about being right, it’s about helping her have a good day”. It sounds straightforward on the surface, but that orientation is what rallied my family around a constructive approach to her care, and I think helped her children let go of the frustration when she’s not the same as she used to be. A session around how to have constructive conversations about changing circumstances could perhaps have got us to the “aha!” moment way sooner. 
Just an idea :) 
-M