This example visualizes a family tree as a static node-link diagram, using color-coded circles to show generational depth from root (red) to children (orange). The hierarchical data is defined as an array of node-parent pairs, then converted into a tree structure using the `d3.stratify()` API and laid out with `d3.tree()`. Links are drawn as lines, with nodes and labels rendered as SVG circles and text elements, all positioned using the computed layout coordinates.