Here are some books that my friend Martha recommended. She is a breast cancer survivor and a patient advocate. She's given you a few more tips as well.
Here are two books that she said helped her....
You Will Need to Get to Know Me
The Power of Conversation
Here are some additional tips for your daughter's mother in law....
Fabulous loving friends got me through and I am the one who will tell you that Laughter is the best Medicine.
I was given The gift of talking and lecturing to others...
These are all great tips for anyone faced with a health issue.