This interactive family tree visualizes three generations of a family, with each node displaying a person's name and colored circles (fill and stroke) to distinguish branches and levels. Using D3 version 3’s `d3.layout.tree` and `d3.svg.diagonal`, the SVG diagram renders hierarchical connections as curved links, with smooth transitions (`duration`) animating node positions on click. The hierarchical data is hardcoded as a JavaScript array, and clicking a node toggles its children, dynamically updating the tree layout.