ocr: parent oldest 2nd aldest oldest youngest oldest youngest Figure 2. Deleting a single node in the middle of the tree is more difficult than removing entire subtrees. When you remove a node in the middle of the tree, you must decide how to fill the hole. One way to accomplish this is to promote one of the children to the original node's position (suppose Dad dies and the oldest son takes over the business, as shown here). The oldest child is always shown as the left- most child node under its parent.
