This example shows a family tree visualization using a node-link diagram. The tree expands downward from a single root ancestor, with descendant nodes connected by curved green paths and colored circles indicating the node’s depth. The data structure is built using D3’s `d3.stratify()` from an array of parent-child pairs, then laid out with `d3.tree()`. Rendering uses SVG, with circles, paths, and text labels appended to a canvas via D3 v5, and React is available as the framework.