Of late he has been spiralling downwards.
I rang just now to invite him out for coffee tomorrow.
He replied - “Do you know my address, do you know what number my place is”?
I replied “Yes, I know where you live”
He replied “How? I have never seen you here before”
I visit regularly; this is a marked deterioration of his condition. 
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Sorry to hear this. I have had dealings with dementia before and know how devastating it can be, not just for the person, but to those around them.