You can set or develop specific relationships between family members, such as "Strict," "Jokesters," or "Difficult". These dynamics influence how they interact autonomously.

Adult Sims who are unhappy or unfulfilled may trigger a midlife crisis, which comes with special aspirations to help them navigate this period. Life Stage Enhancements

Sims now track significant life events, such as learning to walk (Infants), graduating school, or having a first WooHoo. These act as permanent memories and can impact a Sim's future growth.