I think I saw your post in Sims 2 help at MTS?

I have no idea where it is, and this site is dead enough that I'm not sure you're going to get a useful answer here. There is a possibility that you could ask in Modding at MTS and find someone who knows.

Or you can have the twins, grow one up, and move it out.  I'm sorry. I wish I could be more helpful.

All I can tell you is that the token is somewhere in the sim's memory, and you -NEED- to back up the neighborhood before playing with that file. That can corrupt the neighborhood if you aren't careful. Even if you know exactly what you are doing you should have a backup in a safe spot just in case you accidentally change the wrong thing. This is doubly true when you are "experimenting" by doing something for the first time. So please be sure to back up the neighborhood before you open the sim's memories.

It would be easier to use the cake here :http://www.drealm.info/simlogical/sl/Sims2Pages/Sims2_Aging.htm

and age up one of the twins. When they get old enough, use the cat here: http://www.drealm.info/simlogical/sl/Sims2Pages/Sims2_Teleporters.htm    and use a "Make me a ..." to make the child a townie. If you develop enough of a relationship you can age the townie up with other family members, or just move them out as a teen and then send both twins to college at the same time. No need for memory editing or the social worker, and no need to kill any sims. The cake will age up any time, so you can age them again right after you used it the first time. You can just pretend that one of the babies was kidnapped from the hospital or something. Or you can age up both babies and one of the toddlers and send them into the adoption pool if you are tired of the hassle of all those kids in a tiny house.

Edit: the reason I'm linking you to the page instead of the actual download is so you can read about them first. With the cat, scroll down and read about the teleporter plus. The cat is an update of that.