Parents share extensive personal information about their children on social media sites, often starting before their children are even born. As a result, children are now growing up with their online identities formed and shaped from birth through adulthood. This talk will describe the kinds of information parents post about their children online and why they do so. It will also describe the design and evaluation of a web-based game that uses sensing technologies to help families manage Internet use in the home. The talk will conclude with a discussion of how we might better design computational systems to support family privacy and identity online.