If your kids want to learn graphic design you might be interested in Adobe Creative Cloud (Adobe CS6):
How To Get Started with Adobe Creative Cloud - 10 Things Beginners Want To Know How To Do
After you install it then you want to start exploring and learning the world of graphic design with all the tools offered with the Creative Tools:
How To Get Started With Photoshop CS6 - 10 Things Beginners Want to Know How To Do
How To Get Started with Adobe Illustrator CS6 - 10 Things Beginners Want To Know How To Do
How To Get Started with Lightroom 4 - 10 Things Beginners Want To Know
How To Get Started With Adobe InDesign CS6 - 10 Things Beginners Want To Know
And make sure to explore more of Terry White's Adobe tutorials.