*The animations are not that graphic, I made them a bit sims like because the concept scares me, even in videogames*

A sim selector screen will show up showing the sim that you can kidnap, click on their portrait.To kidnap a sim click on them -> Life Tragedies -> Kidnap Sim To Cave.You can now kidnap other sims (Teens - Elders) for a ransom, or to keep them in your household as a kidnapped sim