Envy and altruism have been studied extensively in adults. Here, we report data from an experiment studying envious and altruistic behavior in children. We study a sample of German school children aged seven to ten in a natural setting. We run two treatments. One treatment investigates envy, the other one studies altruism. Additionally, we collect data on the children’s cognitive and social skills, and on their socio-demographic background. Controlling for these factors, we find that older children are significantly more altruistic. Boys care more about their relative position than girls. Socio-demographic information have limited predictive power in both treatments.