So do you create all of the friends and neighbors that your Sims will interact with? I do. It takes me hours to do this. Sometimes days if I build each of them their own house, just in case I may want to play them as well.
The farthest I’ve gotten was a 5 generation, and almost the same thing happened to me that happened to Amish_Ninja, except my entire neighborhood containing this 5 generation legacy vanished… I have NO idea what happened… Just the next time I loaded up, everything was gone…. I cried. :’(