The Sims 4 Juntos Direct

: As Sims experience life, they may gain or swap personality traits based on their actions or events like a Midlife Crisis . Build/Buy & CAS

If you are referring to the 2015 expansion focused on group activities and clubs: The Sims 4 Juntos

: You can set specific relationships between household members, such as being "Jokesters," "Competitive," or "Difficult". : As Sims experience life, they may gain