[post_page_title]The twins’ plan is actually terrible[/post_page_title]
The parent trap for which the movie’s named is Annie and Hallie’s grand scheme to get their parents back together.
We’re willing to accept kids don’t really understand how adult relationships work, and therefore didn’t realize their folks were completely wrong for each other, but their plan has so many moving parts that there’s simply no way it could’ve possibly worked. For one, it hinges on both parents not realizing the child they sent to camp isn’t the same one they got back. Absurdly, that’s actually the most believable part.