Have you read what your kids are reading? Because all Young Adult books are not created equally. The pendulum swings from tame to yikes!
I read the popular YA novel over the past couple of years. I wanted to know the market, the readers - which is not limited to kids - and I wanted to know the guidelines. It's a great genre because anything is possible. It's a area that accepts the impossible, the incredible and there are no limits to the imagination. With a YA you can suspend belief for 300 pages and expand your mind.
Read to your kids, read what they are reading - create a new generation of readers.