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So, since Johnny lives alone, when the last Sim in a household dies everything in the house goes away, including the tombstone/urn. You could go into build on his lot to make sure that's still the case, but... I've been collecting tombstones for my graveyard and have found that, yeah, Sims who lived alone = no tombstone. (Or if the heartbroken family moves away before I stop by... no tombstone.)
Can you set the spooky trait on your home lot? If you can just get him to show up you can cheat to add him to your family, or ask him to join.
Oh that makes me so sad!! I did go into build mode and look, I also moved a new family in and tried build mode that way. I set my home to haunted residential and I'm trying to get my medium to the point he can summon the departed to see if that works!
You need the Spooky lot challenge. It attracts ghosts to the lot. Random ghosts, hopefully including Johnny!
