Additional chapter to my book

I think I may have to add an additional chapter to my book...or maybe even an additional book with lots of chapters on Staying Married Through Cancer.
This is a dicey dynamic....it changes everything. Everyone's world is rocked...everyone has choices to make...that's the "everyone" that is a grown-up...and those choices affect everyone else.
But before I write anything on the subject I will have to figure out the how-to part. So far, I don't have any answers.
Thank you. That is all.