Best thing I can recommend for you to do, is take your family into cas.fulleditmode and save them to your library. This will keep their skills intact. Then you can open up a brand new save and go from there. Since you mentioned you have and use MCCC, you should be able to hunt down the friends they have in the current save and reestablish their relationship. It's under Sim Commands>relationship. Best of luck to you.
I found out the hard way, too, that even though I did the Save As for my game, each gaming session, and used only save after that, ultimately, the save and my favorite Sim got corrupted. He was my Rock Star to be and was for a short time before things went south on me. Had to start him all over from scratch! This happened at the time of the StrangerVille patch and I just now have him back to where he was. Best of luck to you. And I'm very sorry this happened. You're not alone.
