This example renders a family tree as a hierarchical node-link diagram using React and D3 v5. The visualization reads hierarchical data from a JSON file, applying a tree layout (`d3.tree`) and drawing curved links with `d3.linkHorizontal`. Nodes appear as colored labels, with font size scaling by depth and fill color set per node’s data. The SVG supports pan and zoom via `d3.zoom` on the root group.