It has happened to me several times, seemingly when I move households. One I've been playing for years, I moved in the same neighborhood but the family was growing and I needed a bigger home. While the "son" transferred fine, the twin infant daughters did not. They had no relationship with the family at all. I tried MCCC but adding a relationship isn't an option. I tried clearing the relationship and nothing. Tried clearing ALL relationships and nothing. Went into CAS to set them there but it says that one of the twins is recognized (doesn't work in game) and the other one is showing up twice in the family tree - once as the daughter of the father and not of the mother, and the other as the daughter of her own twin!
I don't want to delete these two sims as it's a family I've been playing for years but it seems like it's been spotty on whether or not it can be fixed in the other many times it's happened. Again, when I move a household, the relationship bork.
Came here wondering if anyone else had the issue and if they've found a solution or cheat that helped them fix what should never be broken.
