Methodological Issues in Estimating Genetic Correlation among Friendship Pairs • Tianji Cai, University of North Texas

Do Genes Predict Friendship Networks? The Mitigating Role of School Context • Benjamin Domingue, University of Colorado at Boulder ; Jason D. Boardman, University of Colorado at Boulder ; Jason Fletcher, Yale University

Quantitative Genetic Analysis Reveals Trade-Offs between Age at First Reproduction and Fertility in an Historical Population • James H. Jones, Stanford University

The Influence and Interplay of Family Instability and Genes on Children’s Prosocial Behavior • Colter Mitchell, Princeton University ; Sara McLanahan, Princeton University ; Daniel A. Notterman, Princeton University

Nature + Nurture = Love? A Within-Family Analysis of the Trivers-Willard Effect in Breastfeeding Initiation • Sebastian Schnettler, Universität Konstanz