There is no right or wrong way to grieve, here are some resources that can help.
Supporting your child after the death of a family member or friend, Coalition to Support Grieving Students
Helping Grieving Children and Teenagers, Cancer.Net
Understanding Grief and Loss, Cancer.Net
Talking to Children About Death and Dying, National Alliance for Grieving Children
Talking about Grieving as a Family, National Alliance for Grieving Children
Recommended Books for Children Coping with Loss or Trauma, National Association of School Psychologists