Grandparental investment: the influence of reproductive timing and family size • David A Coall, University of Western Australia ; Marc Meier, University of Basel ; Ralph Hertwig, University of Basel ; Michaela Wänke, University of Basel ; François Höpflinger, University of Zürich

Sharing among sons: resource-dependant sibling competition for reproduction and inheritance among the Arsi Oromo • Mhairi Gibson, University of Bristol

Intra-family exchange and Europe’s low fertility • Robert G. White, University of Wisconsin at Madison ; Laura Bernardi, Max Planck Institute for Demographic Research and Université de Lausanne

The co-evolution of the ageing process, lifespan, and intergenerational transfers • Hillard S. Kaplan, University of New Mexico ; Michael D. Gurven, University of California, Santa Barbara ; Jeff Winking, University of New Mexico ; Paul Hooper, University of New Mexico ; Jon Stieglitz, University of New Mexico ; Katherine Hinde, University of California, Santa Barbara ; Daniel Eid R, Universidad Mayor San Simon, Bolivia