This example shows a network graph of family relationships, with a central parent node connected to child nodes and further sub-nodes. The visualization uses D3.js force simulation to position the nodes and links, rendered as SVG circles and lines. The code applies `d3.forceSimulation` with `forceManyBody` for repulsion, `forceLink` for connections, and `forceCenter` to anchor the layout. Node colors and sizes are defined in a separate `colors.js` module, and the data structure is built programmatically in `data.js`.