That was a difficult read (not in a bad way I hasten to add) but glad you had the strength to commit it to text, it was very moving.
I can only understand to a small degree of what you're feeling.......... my mum was diagnosed with dementia before Christmas and in slow-motion I can see the decline when I visit her every other day (I live 25 miles away). My father left mum back in 2006 and my brother moved up to Hartlepool and so now it's left to me to help her.