A network diagram visualizes family relationships across generations, with colored nodes representing people and links connecting parents to children. The graph uses D3 v7 and an SVG renderer, loading data from a CSV file, and applies a force-directed layout driven by `d3.forceSimulation` with link, charge, center, and collide forces. Nodes are draggable via `d3.drag`, and hovering displays a tooltip showing each person’s name and generation number.