There is no real cheat for getting twins or triplets on the Sims 3 but there is a way you can increase your chances by 90%. You must have enough lifetime happiness for this although. In the lifetime rewards menu there is a reward called "Fertility Treatment" and that will increase your chances for twins or triplets. If you want twins I recommend only giving it to one of your parent sims and if you want triplets give it to them both. Note that 10% of the time this will fail, but I have only had that happen twice before.
I hope this helped you!
To get twins, you can use the cheat "forcetwins" in the cheat console after your sim is pregnant.
It can happen by chance or you can use a cheat: SHIFT+CONTROL+C, then type forcetwins. My sims used the cheat once, then the second time they still had twins so be careful, because the guy can have a gene thing, that makes him have twins.
In the cheat box type: forcetwins.
There's a cheat for it.
On the Sims 2 if you want your sim to have twins,just type in the cheat boxforcetwinsand when your sim gives birth she will have twins!!|Warning: I think this cheat only works on macs
Can only have twins but the cheat is forcetwins
Type in forcetwins in the cheat box.
There is no triplet cheat code. The twins cheat code is "forcetwins".
Use the cheat "forcetwins".
No, there is no cheat code for skills on The Sims 3.
There is no cheat for Mcdonalds in the Sims 2 or 3
sometimes, u just get twins but u can have twins if u want to with this cheat (forcetwins)