How can you get your sims to have a twin boy and girl on sims 2?

Well, you can only have twins RARELY in the sims 2. If you have Open For Bussines, then eat a peice of cheese cake after you woo hoo with your partner. If that does not work, then hit SHIFT-CTRL-C to open the cheat window, after you tried for a baby and hear the luliby, type in Forcetwins in the cheat window and that will get you twins for sure, however you can not chose the gender.