Hey, not sure if you still need help with this or not but for you & anyone else who may need it - you should look up a "Sim Transporter" mod. I use Sim Transporter 08712 (modthesims)
It's not an optimal fix, but basically we're entering a residential lot owned by any Sim, placing the transporter object down and adding our desired Sim(s) to their family. This teleports them to the lot, and you can then have them choose the "Find my Own Place" option from the phone, newspaper or computer to return them from the family bin.
This may change their displayed last name in some menus, you can fix with SimPE.
Worth noting that this most often causes issues with owned businesses, mainly acts as if the business is sold. The lot and all its contents will remain, but it might need to be repurchased.
