‘Friendships, families, pretend play, and the imagination’ examines the influence of the people around infants as well as their imaginative games on cognitive and social/emotional development. How important is the presence of siblings to a child’s cognitive development? Research suggests having siblings is beneficial for social cognition, and even sibling disputes play a vital role. The way in which parents deal with their own emotions influences how a child learns to manage their feelings. Observing pretend play, with adults, siblings, or alone, provides a way to understand the development of mental states and is an important aspect of child development.