StepMoms for teens teaching your children how to be in a relationship and not just with one person is an exciting opportunity for the young woman. By working closely with her stepmother, your teen will learn responsibility, money management, and how to handle the expectations of a marriage. You can find out what you can do that will make your teen more secure about marriage. Teaching your teen in a threesome will keep them from feeling like they are losing everything to their husband and in turn will help her become more stable mentally..