My Sim is missing, $subject problem

[AliceJigsaw]

I met a problem with one of my families. There were 2 Sims and later, they adopted a baby. I played with other families after, and when I came back to the 1rst one with the adopted child, one of them was totally gone. He's missing from the family tree and relationships, and in the other Sim's memories, he's invisible and referred as $subject. He can be seen in the loading screen but that's all. He's totally gone. I'd like to bring him back, it's a little bit frustrating. I tried to relaunch the game when I saw that, but it didn't work. 😞

[mhainesg2001]

Same. Brandi Broke had her baby and when I went to play the Brokes again the baby is missing!