none, sorry (it's completely impossible) :[
You can only have four Sims in a household. So you can only have twins.
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In sims life stories there is no cheat for teen pregnancy.
There is a cheat but it does not work, so no you cannot have triplets.
No teenager on Sims can be PREGNANT. unless you have a cheat, but they cant!
You can take the censor blur off the Sims in the Sims Life Stories by downloading a mod. You can also enter a cheat code to remove the blur. intprop censorgridsize 0 is the cheat code to remove the blur.
To get twins, you can use the cheat "forcetwins" in the cheat console after your sim is pregnant.