[FIXED] Sims in Family Tree Disappearing

Thank you for replying so quickly @SimGuruNick. Unfortunately I do not have a save before the bug occurred as I only noticed it once it had already happened to two of my sims. Will see if it happens on another save 🙈

Hello! I am having the same issue and I have a save file that should help you! This save is from about a day before Lloyd Jones, who is a ghost in my family tree, disappears. It happened right after Malaysia Jones, who is pregnant in this save, has her baby. I don't know if that has anything to do with it or not. Please let me know if this is helpful info! I am very anxious for this issue to be fixed, as I afraid to play the game at all for fear of losing sims. Here is my save: https://drive.google.com/file/d/1grfOJKllnin7h4Ticl6KUKFCRnt2Dyj7/view?usp=sharing

Product: The Sims 4
Platform: Mac
Which language are you playing the game in? English
How often does the bug occur? Every single time now. 
What is your current game version number? 1.50.67.1220
What expansions, game packs, and stuff packs do you have installed? Get Famous, Seasons, Dine Out, and Vintage Glamour
Steps: How can we find the bug ourselves? Look at the family tree.
What happens when the bug occurs? I am doing the 100 baby challenge and I really wish to start with my third matriarch but afraid to do any saves because of this bug. For my first matriarch, some of her deceased kids are just outright gone and I am not even sure what I did to trigger it. Like there is this one save that all of them are there and when like everyone goes to sleep (except for the butler) the family tree goes bonkers.

What do you expect to see? A complete family tree with all the children and all generations reflected
Have you installed any customization with the game, e.g. Custom Content or Mods? Never used.
Did this issue appear after a specific patch or change you made to your system? No

I know you are asking for saves which reflect the not-bugged tree vs the accurate tree and I would really like to help you out because I do have them but I'm not sure how to send them to you guys. As you can see, I am not an advanced gamer if you think about me not having CCs or Mods so the answers for some topics related to this of some players having these and just moving folders or for those without to remove a certain cache folder, I don't even know where to begin with that. I am attaching screenshots instead. Note that I don't usually play in windowed mode if you think that's something to consider. I just did it so I can take a screenshot since I'm using Mac. Anyway, if you check they are literally just a few minutes apart (in Sims time). Also, as my characters are all asleep except for the butler, I really don't believe something triggered it to be like that. Note that I have several saves already and I keep going back to this save and play it again and again and still same results. Literally, groundhog day! :D