https://www.caregiver.org/taking-care-you-self-care-family-caregivers
For Alzheimer caregivers, but relevant to grandparents raising grandchildren

http://www.childrensdefense.org/library/data/caregivers-guide-child-care-early-childhood-education-programs.pdf
Online book: Q&A format relating to education

http://www.childrensdefense.org/library/data/food-and-nutrition-guide-for-children-2002.pdf
Online book: Q&A format. Child health. Includes info on $ benefits.

http://www.nctsn.org/resources/audiences/parents-caregivers
For parents (grandparents) raising children who have experienced trauma

http://www.nctsn.org/sites/default/files/assets/pdfs/DePelchin-trauma-Spanish.pdf
Spanish 2-page guide to understanding trauma in children

https://www.zerotothree.org/early-development
Focused on 1-3 year olds. Covers lots of issues from emotional problems to toilet training; social and emotional development. Addressed to parents, but easily accessible by grandparents.

http://www.storynory.com/
Purely fun. Free audio stories for children. Examples: Wizard of Oz, fairy tales, poems. Can be downloaded or listened to online.