Original: The Creators' work is used to pre-populate The Sims 3 Exchange. In the seventh expansion pack for The Sims 2, The Sims 2: FreeTime, an event occurs in which a Sim-version of Rod Humble, the head of The Sims franchise, gives the player's Sim family an unopened gift box.
Simplified: Also it is said that other Sims will age with the player's Sims as they play the game.