OneDrive deleted MY SIM FAMILY :(

kimmlee19​  Try looking on onedrive.com, both in My Files and the Recycle Bin.  If you find any, simply download them again and place them in the folder Sims 4 is reading.  Here's how to find it:

https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/

You can also check this location:

C:\Users\your username\OneDrive\Documents\Electronic Arts\The Sims 4

It's possible there were files left behind here after you unlinked your PC.