mother's day suprises

Something really weird happened in my game just now…

So, the sim I’ve been playing with all day, Lucy, is a vampire who got pregnant. The baby was born with the wrong skin color, so i wanted to age him up as fast as possible and when he became a toddler, I opened him in CAS to change him etc. But when I saved him and went back to the game, he was back being a baby instead of a toddler and Lucy suddenly isn’t his mother anymore? Like, he’s alone in his family tree menu thingie, no mother and no father? And Lucy is back being pregnant and in her last trimester?

Did this ever happened in someone’s game? Or does someone know how to add Lucy to his family tree?