Kids keep getting taken away

Hey! This issue has been occurring for a while now I took a long break because of how frustrating it's been. My sim kids in the game keep getting whisked away for no reason. This is happening to ALL sims in my game for some reason. Evry single time I load my game if there's a child or multiple children in that  family they get whisked away one by one. Then I go to a different sim family and the same thing happens. Please someone help.