When your sim just starts showing they are pregnant (in maternity clothes),
a bar will show up.. in the bar TYPE the following...
Chat with our AI personalities
There is a cheat but it does not work, so no you cannot have triplets.
It Is Luck To Get Triplets I Usually Get 1 But U Can Get Pregnant On Any Sims 2 Game [On PC] And If U Want Triplets You Need A Cheat "CTRL+SHIFT+C" Brings The Cheat Box Up And This Is The Cheat "ForceTwins" Without The " Then When She Has Her Baby/Babies It Will Say There Is 2 Babies On The Way And She Will Have Twins TA-Da!!
Not naturally, if you want to have triplets then you have to have a download a mod for multiple births.
As far as I know, there is not a cheat that can make sims younger again. Sorry.
No you can't...and there is NO cheat code for mearmaids.....only if u have Sims 2 for PC...