[ARCHIVED] Sims forget already existing relationships

I am playing rotationally as I am trying to keep all the family members aging together even though they live in separate houses. They forget everyone. Cousins, uncles, in laws, don't know each other. I had a sim working on friend of the world aspiration and when I got back even though his former friends were still alive they were culled form his relationship panel and he had to start almost from scratch, only knowing his wife and son. Now I can't stop playing this lot until he gets his 20 friends or he will never get it done!