Classic, sensitive parable about selflessness.
Parents need to know that Silverstein's story really hits an emotional button; readers seem to either love this book or hate it. Some see selfless love as beautiful, even if it's taken to an extreme. It's easy to imagine the tree as a mature, patient mother dependably being there for her child throughout his life. But the tree can also be seen as a masochistic female who doesn't know how to set limits. (Or could the story even be a warning about greedily using Mother Nature's resources?) Still, there's little concern that the youngest readers will grasp much negative meaning from this sensitive parable.