The Sims 4 & Steam I need my 20 years of progress back

Okay I am a avid The Sims 4 player,I've been playing since 2001. Long story short, my son was interested in playing on my PC. He install steam and had the sims there, I disabled my mods, and he commence to build. The next day I sat to play my game and when I went into the sims through EA my family and builds are gone. Only the character he created is there. Is there a way to get my game as it was back. I had so many time consuming builds that took me forever to create and I had my family for generations. I am absolutely distraught, that's my "away from the world" coping mechanism. Someone please tell me this is recoverable.

Oh all my things are saved it's just that my towns are blank. I don't want to go through the task of assigning everyone and everything back to the way I had it.