Winstons Wish — they have a myriad of resources, but also are available for any specific questions via email, chat or phone call around supporting a child or young person during this devastating time
Several suggested the book “Tear Soup” — there’s a Youtube clip of it being read here
Or this “Missing Mommy” book, which is specific to when a child’s mom passes
Kids express a lot through art, so considering some art project to help them express their feelings
