A family tree visualization displays multiple generations of relatives, with nodes colored by generation depth and animated links forming parent-child connections. The example uses D3 v6 with the `d3.stratify()` and `d3.tree()` layout APIs to structure hierarchical data, rendering SVG circles and text labels. Node and link transitions animate over 1.5 seconds, while distinct fill colors—from light blue to dark teal—differentiate each generation level. The data is defined inline as an array of parent-child relationships.