I'm pretty sure you can't but you can just move to another house or lot and get a another one that way.
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The code for the game is on the back of the manual. If you do not have the code you cannot install.
It's on the back of your game guide. There is no legal way to acquire a code without buying the game.
You don't. Maybe you should take care of it in the first place and you wouldn't have this problem.
You can't. Once your sim is pregnant there is no going back, so you better be sure before you try for one!
If you mean how do you get the family back after you put them in the family bin... you cant... sorry! You either have to make another family or leave it!