My sim had twins, and I did not want twins. I could not figure out how to delete one, so I kept ageing the one baby twin until he was a YA I then I moved him out and then deleted him. I am glad I can ...
@igazor Before I started using mods I played a baby challenge and had to move babies around and the only way I could do it was to move an adult with them, then move the adult back where I wanted them.