This example shows a family tree with animated connections and labeled circular nodes on a green background. The tree is built from hardcoded parent-child data using `d3.stratify()` and laid out with `d3.tree()`. SVG elements render the visualization, with paths animating from source to target positions via `transition().duration(1000)`, while circles and text labels appear with a shorter transition. The code uses D3 v6 and appends all elements directly to the body.