So you found your mom sitting on the couch with a bag of Cheetos and a Sprite reading Twilight, or the Hunger Games, or Eragon. What to do you're wondering? Well, you are not alone. YA fiction is a fast growing tumor that is spreading rapidly amongst the adult population. Young Adult fiction (in my humble opinion) is often better than the books on the adult shelf and with such authors as JK Rowling, Rick Riordan, and Stephanie Meyer breaking out staggering best-sellers expect YA to continue to rise in popularity. Here is a great article by the LA times documenting the phenomenon: http://articles.latimes.com/2010/mar/08/entertainment/la-net-young-adult08-2010mar08
I suggest you read it if you're at all freaking out about your mom stealing your books--Don't worry--it's normal!!