And every morning the way home gets longer and longer by Frerick Backman

Grandpa's grasp on his memories grows dimmer and dimmer.  He fears the day he will not recognize the people he loves.  And so he talks to his grandson Noah - about his life, about Grandma, and often about Ted, his son and Noah's father.  This is more the last moments of memory than the first moments of the disappearing.  Grandpa is much more at ease with Noah than he ever seemed to be with Ted but it is clear that even the uncomfortable memories are ones of caring for one another.  A novella which is touching without being sappy.