To help increase your chances go into Life Happiness Rewards you can buy the Fertility Treatment which will increase your chances, but you can have the mother watch the KidZ Zone TV channel and listen to the Kids channel on the radio. If you do them both at the same time you have an even greater chance. Also getting the fertility treatment and doing these things will increase your chance of triplets. If you have your Sim eat three watermelons in a row, she will probably have a girl. If she eats three apples in a row she will probably have a boy. Hope this helps! :-)~ go to the cheat bar (push ctrl shift and C) and type in force twins ( do this after the Sim is pregnant.
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To get twins, you can use the cheat "forcetwins" in the cheat console after your sim is pregnant.
In the cheat box type: forcetwins.
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.
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
Use the cheat "forcetwins".