And if you don’t know who that is, I am so sorry. I recommend Good Omens, an amazing introduction to both Sir Terry and the inestimable Neil himself. Then warm up on some Discworld books, hitting Guards Guards early and not stopping until you have at least hit Night Watch.
Oh, that’s so sad.

RIP
I have a friend whose H has end stage Alzheimer’s, plus I just watched the series finale of Parks & Rec.
I’m a mess.
My son has read MANY Of his books. Sorry to hear this.
Love his books.
I just met Amanda Palmer last month at a reading, and she was talking about all their writer friends, inc Terry.
( she is Neil Gaimans better half)
An essay that Gaiman wrote about Terry, years ago.
http://www.neilgaiman.com/p/Cool_Stuff/Essays/Essays_By_Neil/Terry_Pratchett:_An_Appreciation
And something he wrote last fall.
http://www.theguardian.com/books/2014/sep/24/terry-pratchett-angry-not-jolly-neil-gaiman