Alright, here's some more on my totally boring family tree saga. It seems to be turning into a sim version of Invasion of the Body snatchers.
I downloaded the doopercomputer, and had a look at some background stuff. It seems that what is happening at that particular moment is that the four Bagley sims are being duplicated with what can only be described as empty, if visually identical, clones. They seem to have little data tied to them, and no relationships. However, the other versions of them still retain the relationships (and presumably all the other data). Rhoda (the playable ghost) still
seems to be the same sim, bar her portrait and age which is much older than it should be (and of course the borked family tree). Her "clone" (which I think is the original Rhoda) has the correct portrait and age though. So I can only assume that these mysteriously spawning duplicates are replacing the other sims, for whatever reason.
Case in point: At 12:09 am there is only one Ma Bagley. At 12:10 am there are now two. One with a whole bunch of data, and the other an empty shell.
Then I did some playing around with the old save, seeing if I could prevent it occurring or at determine what the cause is. I thought it was some sort of pre-determined BFBVFS, but the only time it didn't happen at all was when I did not send Rhoda on holiday. It seems that sending playable ghosts abroad (or, at least,
my playable ghost) is causing some kind of fuck up. It's like BV redundancy all over again.