About a year ago my grandma was diagnosed with dementia. As the year has gone by my grandma has slowly gotten worse. Today, she called me convinced that my sister robbed a bank on Saturday, even though all three of us were together for a birthday all day. I looked at the article she was looking at and it was a black woman ( my sister is Caucasian) as I proceeded to tell her that it wasn't her she got more agitated and upset (sobbing, hyperventilating, etc.) she kept recalling parts of the day that never happened. And all I could do was correct. Which caused her to be more upset. How do I, for the future, convince her that she is wrong but not make her upset?