You'll find below some excellent resources related to digital citizenship and chromebook use that will be helpful for parents in their conversations with kids.
Parent Resources: Privacy & Security, Online Safety, and Digital Citizenship
Follow this link for loads of information about privacy and security as it relates to google apps for education, chromebooks, and more: https://goo.gl/aHFBHf
Follow this link for information and ideas about how parents can help keep kids safe online including setting digital ground rules and helping kids be smart and confident explorers of the online world: https://goo.gl/Q3X8fJ
Follow this link to learn more about Learning with Technology in a presentation created by Common Sense Media--one of the key resources we go to when we teach Digital Citizenship in our curriculum to all students here at LJHS: https://goo.gl/6m1q17 . You can also find many other excellent resources tailored to parents' needs and concerns at www.commonsensemedia.org.
Here are a series of Digital Literacy resources from the folks at Teaching Tolerance: https://www.tolerance.org/frameworks/digital-literacy
One final resource to help your kids think about Digital Citizenship and how to "Be Internet Awesome" (and another resource we use in the classroom): https://beinternetawesome.withgoogle.com/en/resources