A cousin network diagram shows ten family members as yellow nodes connected by red, arrowed lines, with thicker lines indicating stronger relationships. The visualization uses D3.js version 6 with `d3.forceSimulation` to apply link, many-body, collision, and center forces for layout. Rendered as SVG, nodes are draggable circles with labels, and hovering highlights connections. The data comes from a JSON file defining person nodes and "cousin of" links with weighted values.