Mint Butterfield, center, is the child of Stewart Butterfield and Caterina Fake.Matt Winkelmeyer/Getty Images for Wired, Marin County Sheriff's Office, Andrew Toth/Getty Images for Vanity FairMint Butterfield, whose parents are major tech founders, was found safe, police said.Butterfield was missing for a week and considered at risk.Butterfield's parents cofounded Flickr, and their father later cofounded Slack.