This interactive tree chart displays a family genealogy, with the root ancestor “chandraiah” branching into children and grandchildren. Nodes representing each person are drawn as cyan circles with blue outlines, connected by black curved links. The visualization is built using the D3.js library (version 3.5.17) and its `d3.layout.tree` and `d3.svg.diagonal` APIs. Clicking a node collapses or expands its subtree with a smooth 750-millisecond transition, and the SVG is rendered with animated updates to node positions and link paths.