"The Giving Tree" by Shel Silverstein centers on the relationship between a tree and a boy throughout the stages of his life. In each stage, the tree provides the boy with whatever he needs, ultimately giving him a stump to sit on when the tree has nothing else to give.
Positive interpretations of this story paint it as a parable of unconditional love. But some might interpret it as an abusive relationship, with the tree allowing itself to be destroyed to keep the perpetually dissatisfied boy happy while receiving nothing in return. Other interpretations compare this relationship to those between a mother and child, two aging friends, or Mother Nature and humanity.
An interesting discussion to have with children after reading them aloud!