Travis Barker and girlfriend Kourtney Kardashian‘s kids have known each other for years, growing up on the same street in Calabasas. Now that the pair have embarked on a romantic relationship, their children are getting even closer. That much was evident when Travis’ 15-year-old daughter Alabama shared a series of Instagram photos from a ski getaway on Apr. 2, and in one snapshot she was carrying Kourtney’s son Reign, 6, piggyback style on the slopes.