This interactive tree chart displays a family hierarchy, with each member represented as a clickable node and connected by blue links. The visualization uses the D3.js library (version 3.5.17) with SVG rendering and animated transitions. Users can click nodes to expand or collapse branches, with the tree layout recomputing positions dynamically. The chart features a custom style with cyan circles, red strokes, and an orange background, while node colors shift based on child status. The code implements the `d3.layout.tree` and `d3.svg.diagonal` APIs for structure and path drawing.