Another book that I have, that has helped me in a way that is both hopeful and inspiring is:
How To Pray For Your Children, by Quin Sherrer. I have learned a better and more fruitful way, and to keep at it, of praying not only for my children but grandchildren as well.
I have included a 'prayer for adult children' on my other web site:
www.prayforourchildren.com.