In a recent game save, with the addition of Infants, I took a sim, never played, but had created and saved in my library. I aged her down and was just intending on letting her grow up, develop, and progress with her as she grows up. I was intending for her to be an orphan, so I placed her with a single premade sim. I really was not going to do much with the Young Adult female other than just a caretaker. She was originally just going to bounce around from household to household, but apparently, the game had other ideas. While the YA sim was playing with her and having tummy time, all of a sudden I had an option for the YA sim to adopt the little orphan infant. At the time they were not related, and their relationship was not really that high either. I am playing a vanilla game (no mods or CC).
