This example shows a hierarchical social network chart based on family tree data, with nodes and links rendered in SVG. The visualization uses d3.stratify() and d3.tree() to compute node positions from parent-child relationships, then draws animated paths between connected nodes. Each node appears as a light green circle with a dark green border, labeled with a child name, while the blue background contrasts the lime-colored connecting lines. The animation uses D3 transitions to grow the circles and draw the links over time.