These articles offer some tips for parents on how to establish good communication lines with their kids:
http://westvalleyparents.com/establishing-healthy-communication-with-your-kids
http://www.independentmail.com/news/2010/oct/17/guest-column-parents-children-can-learn-talk/
http://www.childbehaviorproblem.net/parent-child-communication/parent-child-communication2.php
http://www.livestrong.com/article/281060-abcs-of-effective-parent-communication/