This chart displays a third-generation family tree from a GitHub-hosted CSV dataset. D3 v7’s `d3.stratify` converts the flat data into a hierarchy, while `d3.tree` calculates the layout for the SVG rendering. Node circles are color-coded by generation depth using `d3.scaleOrdinal`, with parents connected to children via `d3.linkVertical` curves. A tooltip appears on mouse movement to show additional details for each family member.