I started a new game and I quickly realized it's not panning out how I wanted it to happen. I had a teen sim who lived with her horrible mother and father who kept popping out kids that they neglected...
Sorry to say that, but if you didn't save a copy of the child to your gallery, they are gone. Sims 4 doesn't work like sims 1/2/3, and it deletes after the child is taken away.