I don't know when this started because I don't check the family tree very often. However, as of today, I am missing a few sims that I know of that just disappeared from my legacy family tree. I have their gravestones in the family crypt.
I was playing with Eldarion Wyllt-Pierman and Aragorn Wyllt-Pierman in Late March 2025. The wife and mother, Arwen, DOES show up in the family tree breakdown. They had one child, and Eldarion died as an elder from overexertion while working out. He had a child, Beatrix, and she had one child, named Calliope. Both female sims show up. I'm not sure why Eldarion and Aragorn don't show anymore.
I previously posted about a sim that was dead but still showing up in this family tree as alive. I'm not sure what's going on with my legacy sims' family tree, but there are a bunch of rebirths, so maybe that's where the bug is happening? Because the sim stuck as alive but is actually dead is rebirthed. Aragorn and Eldarion were rebirthed too.
Thanks in advance!