Two things I need some clarification on - moving sims in and out and supernaturals. I noticed one of the existing challenges moved in a released genie, seemingly permanently and now I'm confused about that.
Non-heir household members can be move in and out. You can move in a genie as a spare to help out around the house, not a problem. You cannot move in a genie as a spouse because of the life state restriction for heirs.
Also, regarding permissible use of life states elixirs following the birth of an heir, does that mean that the founders can become long lived life states? .
You are free to use whatever methods you wish to extend the founders life, only after the heir is born.
The main reason people would want to extend founders life is to accumulate enough LTR points for the large tombstone when they die (moving requirement). Why would you want to turn your founders into vampires that never dies? You want your founders to die eventually, you don't want them to live forever.
With moving out, are spares allowed to get pregnant before they leave the household?
Spares can pretty much do anything, as long as they don't get impregnated by the active heir. Active heir needs to finish the 4 requirement before he/she can add to the household.