This research project examines the way that children and parents talk about science outside of school and, specifically, how they show distributed expertise about biological topics during visits to a science center. We adopt a theoretical framework that looks at learning on three interweaving planes: individual, social, and cultural (tools, language, worldviews, and artifacts). We analyze conversations to study how these three planes show learning processes as families work together to create explanations of biological phenomena. Findings include: (a) children and parents made epistemic moves