This interactive family tree visualization displays genealogical relationships using an animated, collapsible node-link diagram. Built with D3 v3 and SVG, it loads hierarchical JSON data from `family-data.json` and renders colored rectangular nodes representing family members, with links labeled by relationship direction. The visualization includes zoom and drag capabilities via `d3.behavior.zoom`, tooltips on hover, and smooth transitions when expanding or collapsing nodes through click interactions. The code uses `d3.layout.tree` for layout calculations and custom collision detection to prevent node overlap.