Listed below are resources that provide information on children dealing with grief and loss.
Articles:
Explaining Death To A Child - Children's Hospital of Philadelphia
How To Talk With Your Kids About Death: An Age By Age Guide
Do's and Dont's Of Talking With Your Child About Death - Psychology Today
How Children Understand Illness and Death - American Cancer Society
Websites:
http://kidshealth.org/parent/emotions/feelings/death.html
http://teacher.scholastic.com/professional/bruceperry/child_loss.htm