Actually, you can do all of this using the InSIMenator. Use the Summoner to summon the child back to the local lot. Use the family tree to Add to Household. Install sshack to prevent the obnoxious social worker from taking your kids again.
Thanx for the info jase439... I just downloaded the InSiminator and haven't worked with it yet...
When I lost two of my kids, I was just getting started with TS2 and had no EP's installed and very few hacks and mods to work with... I decided to give the Shrub a try and was really surprised that it was able to bring them back...