I think you need to be a mummy and curse them!
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In the sims 3 it is impossible to kill a baby.
You get both of the sims to be enemys...but I don't think one sim can kill the other. But there are multiple ways to kill a sim with a cheat: 1. Type "boolprop testingcheatsenabled true" without the quotation marks 2. Shift click on the sim you want to kill 3. Click Spawn 4. Rondeys Death Creator 5. And choose one of the following! :(
Just kill your Sim the normal way.
there are many ways that sims can die or be killed on the sims 3 wii,here are some reasons:flies,drowning,fire,electrcution,and old age
No. Not that anyone has proven yet.