A multi-generation family tree loads from a GitHub Gist CSV and renders as a vertical dendrogram in SVG. D3’s `d3.stratify` builds the hierarchy from child–parent pairs, while `d3.tree` computes the layout. Each node is a circle color-coded by depth (generation), connected by curved `d3.linkVertical` paths. Hovering over a node shows a tooltip with the person’s name and parent via mouse events on the SVG groups.