One day I went to sleep (what was I thinking)and my population went from 16 to 5 no expleniation fire was up food was plentiful just woke up and they were all dead. Had four men and one women. For some reason she would only mate with the esteemed elder so now my population is up to 12 all from those two. Everytime that poor woman put the baby down he was all over her again. I am hoping when I have to mate siblings, the result isn't a baby with four arms. Goddessjuno
Actually, a villager with four arms would be a boon because (hopefully) he or she would be able to be at least twice as productive as a two-armed villager! But no, once villagers reach adulthood, their lineage no longer matters and they can mate with anyone and everyone else within the village without unfortunate consequences.