This example presents an interactive family tree diagram rendered with SVG and animated transitions. The visualization uses D3.js’s `d3.layout.tree` to compute hierarchical node positions and `d3.svg.diagonal` to draw curved links between generations. Nodes appear as red circles with blue outlines, labeled with names, and users can click any node to collapse or expand its children. The tree’s layout normalizes horizontal spacing by depth, while entering and exiting elements animate smoothly via `transition` methods over a 750-millisecond duration. The data is a hardcoded array representing three generations of a family lineage.