A family tree visualization maps a lineage from grandparents to children, using a hierarchical layout. Each couple is displayed as a rounded rectangle, with the partners' names separated by a vertical divider, while single children are shown as circles. The chart uses d3.tree for the layout, d3.linkVertical for curved edges, and d3.csvParse to load the family data from an embedded CSV string. Node shapes and colors are assigned by the d3.scaleOrdinal scale based on each member’s generational type, with SVG rendering used throughout.