How to Force Twins in Sims 2by ContributorUpdated September 22, 2017
Trying to have twins in Sims 2? Well, the good news is that it can be done, sometimes even without hacks. There seems to be about a 10 percent chance of your pregnant Sim's having twins, but you can increase that percentage.
Select a pregnant Sim in Open for Business. Open the cheat box by holding down "Ctrl," "Shift" and "C." Type "forcetwins" into the box (no quotes).
Have the pregnant Sim eat cheesecake and she will almost certainly get pregnant with twins.
Move the Sim family to a sparsely populated neighborhood or town. They are more likely to have twins where there is a smaller population.