This interactive tree diagram displays a family genealogy with animated expansion and collapse of branches. Built with React and D3.js v3, it uses `d3.layout.tree` to compute node positions and `d3.svg.diagonal` for curved links, rendered as SVG. Clicking a node toggles its children, with transitions animating nodes and links via `transition().duration()`. The data is a hardcoded JavaScript array of family members, styled with cyan circles, green links, and a light pink background.