If you're missing any families, have a look in the My Library tab as a copy of each family created gets saved to the library every time you create and save a new family. These files get saved in the Tray folder inside the Sims 4 folder. - C:\Users\Username\Documents\Electronic Arts\The Sims 4\Tray
Or check Manage Households, it's up in the right corner for the map screen.
In the My Households tab (which is automatically selected) you should be able to find what families are in-game and what world they are in. To play a family, find them in the world they are in and select them to play.
If they aren't in Manage Households, maybe you saved your game playing one household and then switched to another household before exiting the game?
If that doesn't help, click Load Game to see what other saves you have. Check each of those saves through their Manage Households to see what families you have in those games.
** Important Notes:After the game saves the 5 original backup files, it starts over making new backup files and
will overwrite the old backups as you continue saving the game using Save.
If Save is continually used, the game progress gained or family played may be lost. This is why it's important to use Save As, give the save a new name, save often and back the files up in case they maybe needed later.
If you exit CAS or the game before the household is finished being created, you loose that family and will need to start over.
However if you've already created the household, but not placed them in the world you need to load the game and either click the Play button to continue from when you last played, or Load Game button to select the household.
Sim families from another game save cannot interact with another Sim family from a different game save. To get them to interact with each other they need to be in the same game save.
To get the families all into one game save, go to the main menu and click Load Game for each of the families you want to save. Save the family and their house to the library and place them into one game save.
How to Save Family to Library:
- From Manage Households - Select family, take them into CAS (click the pencil icon in lower right). Then click the folder in the upper right corner to save to the My Library tab.
- In-game - Click on the mirror, dresser or closet and select Change Sim.
How to Save House to Library:
- From Build mode, select the folder in the upper middle/top of the screen and select Save lot.
The My Households tab has player created, played or unplayed households. Sims in the Other Households tab may loose progress information such as skill levels, relationships, etc.
If you don't want this to happen to any of the households, click the heart to the right under the household's photo to move them to the My Households tab.
In case you need help with anything mentioned above or need help restoring or renaming a saved game file, please see the posts linked below.
How to Play/Start the game?
http://www.carls-sims-4-guide.com/forum/index.php?topic=21899.msg450011#msg450011How-To: Restore a Saved Game
http://www.carls-sims-4-guide.com/forum/index.php?topic=21519.msg387147#msg387147Saving Sims to Library
http://www.carls-sims-4-guide.com/forum/index.php?topic=26325.msg439597#msg439597How-To: Save A House/Lot To Library and Sharing it to Gallery
http://www.carls-sims-4-guide.com/forum/index.php?topic=26324.msg439569#msg439569Families Keep on Getting Deleted
http://www.carls-sims-4-guide.com/forum/index.php?topic=29389.msg473904#msg473904