At 18, you are an adult in every sense of the word. Sure, your frontal lobe hasn't fully developed, and you're going to make a whole lot of bad choices over the next seven or so years, but the difference between 17 and 18 is that you're going to be solely responsible—and accountable—for those decisions. That means the way you engage your personal relationships and the decisions you make for your future are on you, despite your relative inability to properly rationalize them and your lack of experience in making them.

If you're fortunate and privileged, you'll still have the support of parents, guardians, and other mentors who push you in the right direction. If you're even more fortunate, you get to spend these years in a structured simulation environment called "college," where you get to engage with other frontal-lobe-ly challenged "adults" where you can go on adventures and make all kinds of terrible decisions that you'll look fondly on and/or regret for the rest of your life. But regardless of whether or not you attend this life-simulator, you're going to have to start getting your act together and taking responsibility, which is why the behavior of this 18-year-old, despite her tragic background, needs to desperately be adjusted.

This stepmother has been really struggling to develop a closer relationship with her 18-year-old stepdaughter, who has not adjusted well to her blended family, saying horrible things about her stepmother, who she has known as a parental figure for most of her life. This tragically complex situation is probably a signifier of some underlying trauma that the young woman is dealing with, but it prompted the stepmother to turn to this online community to see whether or not she was in the wrong for telling her stepdaughter to leave their home, to which the young woman complied.

Who knew that evil stepsisters were still a thing? One would think these two teenagers would get a grip and be kind to the Cinderella of this story, rather than lean into the Evil Stepsister caricature. Unfortunately, however, they could not help themselves.

This Redditor was traveling with his family for a memorial service, and his wife booked a hotel room for his daughter Shiloh and two stepdaughters to share. Things went a bit south when the stepdaughters insisted that Shiloh sleep on the floor. When the original poster (OP) discovered that this was going on, he told Shiloh to pack her things and immediately booked her a separate hotel room.

This ultimately backfired as the two stepdaughters went crying and complaining to OP's wife (their mother), accusing OP of playing favorites. The fact that OP's wife had the audacity to not hear and empathize with her husband's side of the story leads us to believe that this second marriage is unlikely to work out. For more stories like this, check out this post about some Thanksgiving drama.