Something weird is happening with a ghost.
Thornton Wolff died. Grimm came and took him and his urn appeared. I've got a kind of "dead-ex-family-member" wing of my immortal museum where I placed the urn, together with an ice sculpture, portrait and photos of him from his life.
Thornton has basically come back after he died (he appears as a ghost) and is with the family 24/7. Currently in game it is 14:25 (aka 2:25pm) and he is currently sitting at a chair in the dining area. Has something changed with ghosts so that they'll be there all day everyday? He hasn't eaten ambrosia or life fruit, he hasn't been given any of those treatments/potions that extend sims lives/reverses aging and those opportunities to bring ghosts back haven't been accepted by me for my sims.
He isn't really doing anything to interfere with the game, (he's not part of my controllable family) he's just around all the time.