REQUIRES THE XML INJECTOR MOD
Instead of releasing all Ghosts one by one via Urns/Gravestones in each Household you can use the new "Release all Ghosts" Option on Urns/Gravestones. It will release all Ghosts without deleting them from the Family Tree. Ghosts that are in Households are not affected. "Get Urn for" will add a Urn inside your Sims Inventory which stores the Ghost Sim/Pet. This is helpful if a Sim dies off Lot which usually does not generate a Urn.