I'm playing in Sunset Valley and since I play there most of the time, I know that, unless some accident occurs, the first sim to pass away is Buster Clavell. Since I love ghosts and love having a full cemetery, I kept an eye on him. Then, one day, he wasn't a family friend (but I hadn't received a call about it) and so I switched over to the Clavell household to check. Lo and behold, he was no longer a member and his wife had a broken heart from witnessing death. But his gravestone was nowhere to be found. There wasn't an urn either. I checked the entire household and the family inventory. I checked his wife's and his son's personal inventory. Nothing. So I had his wife check in at the mausoleum to manage his gravestone. It wasn't there either. I figured it was a one-time thing.

And then it happened to Yumi Sekemoto. My main sim had an opportunity that he had to repair a laptop and give it to her. Then I got a notification that the opportunity couldn't be completed because the target was missing. So, hoping to catch death in action to prevent losing the ghost, switched over to the Sekemoto household. Yumi was already gone and there was, yet again, no tombstone. When I clicked on Leighton's family tree, she appeared as a blank thumbnail and was listed as unemployed (rather than deceased or anything else). I tried using the Master Controller to create an urn for her, but it said there were no urns to be made. When I went to manage the dead again, there were no tombstones again.

What is going on?

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MasterController didn't help, huh? The dead Sims are no longer related to the rest of the Household?
Tried the other mods suggested in the Missing Sims sticky? ie ErrorTrap or DebugEnabler?

Do you have CC, other than MasterController? Ruled out broken, outdated, conflicting CC?
Whose StoryProgression mod do you use: Twallan's, Pescado's or EA's or other small tuning SP mods?
Does this occur only in this one save, just this one world? Or across the board?
Do you have the reported issues with Inventory like stuck hand, not being able to fish, etc...

The dead sims are related, yeah, but they have blank thumbnails when I look at their living relative's family tree. Not blacked out sims or anything, but just blank. I do multiple saves of the same world. In one of the saves, Buster Clavell's thumbnail showed him as alive.

I didn't notice the missing sims sticky. I'll look through that to see if it will help. Thanks

I have CC other than Master Controller, yes. The only things I have are hacks, and not too many. I haven't patched my game to the most recent patch (just the one before it) so my version is 6.1.11.009017. I didn't patch because the newest patch didn't do much and I didn't feel like fiddling with and waiting for hacks to update. All my hacks are updated to 1.18. I haven't had this problem before. I use Awesomemod for story progression. It doesn't happen if I Force Kill a sim using Master Controller. If I use Force Kill, their tombstone/urn will appear and I can go to the graveyard and manage them properly. Phone calls will also ring in to notify that the sim has passed away.