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I Had a lady with twin girls, She Married a rich Millionaire above She moved upstairs and her toddler girls are still living downstairs with only the butler to look after them WTF happened?

Wow, that is a real problem.  If you want to play this family still I would use a cheat and age them, move them in with mom and then age them back down if you want them to still be toddlers.  Myself, I find toddlers a pain and always age them to child.

Wow, that's strange. Did you not add them to the little pop up that comes up when you're combining households or something?

Just move them out of the apartment and into the one with mom. Easy peasy, no cheats needed. Next time when marrying a mom with kids when the menu pops up that asks who is moving with the mom, make sure that the pictures are moved from left to right with teh "add" button, before you hit the check. Just like with parties. :) I have messed that one up a couple of times myself. LOL

I am surprised the game allowed her to move out without her children!  Did you have the butler selectable at the time so he looked like he lived there or something?

No Box to ask me to add them comes up just the mother moves out. I didn't have a butler either so they were Alone, It's happened twice now but only on Apartment lots, Regular house lots work fine

You can D/L a hack from Simlogical,then enter the mothers new family and move the twins in.
You'll have to use a teleporter hack.
I'll try to give you a link.
Here it is:
http://www.simlogical.com/sl/Sims2Downloads/Sims2_Teleporters/TeleporterShrubPlus.zip

It's a schrub,called Teleporter Plus,you'll find it in the garden section.
Click on it when in the mothers apartment,click on the family name,teleport them there one by one then chose Move in...
and move them in.

It's actually better to get a more up to date version of my teleporter if you have Apartment Life