Recently, it also happened to me that some deceased Sims disappeared from my family trees. However, in my game they are not replaced by a placeholder picture - there is just nothing like they have never existed at all. And in the past it would be possible with the cas.fulleditmode cheat to add this Sims again to the family (if they were still saved somewhere and the generations are not too far away), change their relation to mother or father/son or daughter, but this option is not working anymore in my game ( I can only change their relationship to be siblings or romantic if I've an option at all). Now I don't know what to do. It is really sad and frustrating. Besides I don't want to use mods to have my family tree restored.
