Re: Entire household disappeared?
@hyfrdeanna Immigration and emigration are controlled by NRaas StoryProgression, so if you didn't already have SP installed, you were working with the default emigration system built into the game. This system is unreliable at best and will absolutely do things like remove an entire household for no reason at all. With NRaas SP installed, emigration is off by default, although you can enable it, either in general or for a specific household, if you want.
To be extra specific, NRaas mods would never emigrate a household or delete a sim without your permission, but the mods can and will clean up leftover data if they find it and can't resolve it. So without the mods, you might have had some stray info about your sim's friend, whereas with the mods, that info is removed too.
Regardless, all you can do from here is find another copy of the household, for example in a new save in the same world, save that household to the bin, and deposit it into your current save. If you want, you can use NRaas MasterController to rebuild the friendship and any other data you care about, for example careers or money or other relationships.
