This example shows a vertical family tree for ICE-8 Section 2A, using a parent-child data array to display three generations of descendants from a single ancestor. The visualization uses d3.stratify to convert the flat data into a hierarchy and d3.tree with vertical links to lay out the nodes. It renders as an SVG with blue circular nodes and concise text labels positioned above each person, with the root individual, John, at the top and all descendants branching downward.