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Today my mother told me that my father said to her "Who are you?"
Probably she was sad and disappointed that who lives together long time couldn't understand herself.
I can't understand her feel because I can't guess that situation.
Recently, my job is too hard for me because I have to work about what I can't be able to understand task.
Also my family time has some problem about my son, actually I can't satisfied current days. Its hard to continue these days.
And I have to look after my parents with dementia alone even though I have brothers.
I'm tired. 
Recent days, my father ate slowly, move slowly, sleep almost of days.
But sometimes he talked to my mother, and laughed certainly.
If he won't be able to talk to my mother, anyone express him "alive"?
I'm not sure about tomorrow.
However, I can live with my family. Its sad but I can't do anything.
I just can listen my mother speaking, as well as I can.