Peter- the old man is harbouring her because she is his wife- it's evident from the story as the main characters have been known to the couple since they were really young.
They (at least) believe she has cancer, but she won't go to the hospital as she is afraid of dying in there- very common with old folks who know they are going to die- they want to do it at home.
Whilst it's fairly obvious to us that she is afflicted with something more than cancer, he was obviously in denial and believed he could cope.
All of this has been made reasonably clear in the story- go back and read it all so far in a oner- just to refresh before the final part.
You won't be disappointed- it really is a cracker of a story.
Also, for w3bz, out of interest:
Can you reveal which software you use to make these trailers?
We do some band vids for oor youtube channel using Nero vision and Ulead. I only have a little experience at this as a former band member used to do it, but now I'm having to learn.