The Sesame Street resources for toddlers and preschoolers on military families (Deployments, Homecomings, Changes) come highly recommended. The Sesame Street video and parent/caregiver materials are also available for download here: Deployments, Homecomings, Changes
Sesame Street has a new project called When Families Grieve. Here’s the PBS Parents page for this. You can also see the preview video and more on youtube.
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