Though adults often internalize anger, in children anger is often dramatically externalized. Because children often feel especially powerless and out of control in reaction to loss, it will be helpful to offer grieving children lots of both predictable structure and choices in their lives to show them that there are many things over which they can feel and have control, despite their powerlessness over the loss of their sibling or their parents' sadness. Being especially sensitive to this feeling of powerlessness in grief by offering structured, either-or choices about food, clothing, recreational options, etc. Children can find goodbye rituals as important in resolving loss as do adults, and may even develop their own. Rituals can be either formal or informal, conscious or unconscious.
Children are often better than adults at developing rituals.
Thumb sucking and security blankets are actually informal, unconscious rituals. Looking at photo albums, planting a tree in memory of the lost sibling, lighting candles are some options of formal, conscious rituals your family might consider. The song is about a hunter chasing a rabbit who is rescued by a man in a cabin. Jamie was insistent on the song, even though he cried nearly inconsolably as the hunter came near. Wendy trusted Jamie's need for the song and the tears.