In The Sims Family Edition (a stripped-down, budget release based on The Sims 2 engine), the “Try for Baby” interaction is hard-coded to stop appearing after two children. There’s no in-game cheat, reward, or aspiration unlock that overrides this limit.
Family Edition was designed as a simplified, entry-level product. EA removed many systems from the base game—including the deeper family dynamics, genetic inheritance, and unlimited household slots found in The Sims 2 proper. The two-child cap is a deliberate design constraint, not a bug.
Community mods (e.g., via ModTheSims) can remove the cap, but:
If family gameplay matters to you, upgrade to The Sims 2 (Ultimate Collection), The Sims 3, or The Sims 4. All support unlimited children (within household limits), full genetics, adoption, and robust family trees—no mods required.
Family Edition is a snapshot, not a sandbox. Enjoy it for what it is, or move to a version that lets your legacy grow.