@fruitsbasket101 -That sounds like what happened to one of my early saves after Malcolm Landgraab was taken away by the social worker and my toddler had the family dog in his family tree as his mum and the family cat was listing as his dad.Other sims had vehicles or household objects in family trees and I lost it because it got corrupted.It sounds like yours might've gotten corrupted that way without you knowing it.I lost three saves from social workers removing children and one was taken from my family.I'd got with using almost the entire Nraas Mod collection as I am using 109 NRaas Mod files and haven't had saves corrupt like that for a long time and I would also get a no social workers Mod to remove them as they can delete sims from your save outside of your control and that corrupts saves.