Sims family not showing

D4ANKYD4NK  Do you have OneDrive running on your computers?  That would explain why the save showed up on your laptop, and it could explain why the save disappeared from your desktop as well.  Please see the first post of this master thread:

[CURRENT ISSUE] Sims 4 saves/user content disappearing (PC) | EA Forums - 11838402

If you want to keep using OneDrive, download the user data to your desktop, then use the "always keep on this device" option mentioned in the guide.  The post is long, and anchors don't work on this site yet, so use ctrl-F to search for keywords and navigate that way.

If you don't use OneDrive, are you using Steam's cloud syncing service?  Last I heard, it didn't work with Sims 4 data, but I don't have a Steam install myself to test with.