The last couple of years haven't been easy for Rob, who's kept extremely private, especially when compared to his very open siblings. In fact, his 31-year-old sister, Khloe Kardashian, recently opened up to Complex magazine
about her little brother. "I call him my son as a joke," she said. "I'll call my assistant and be like, 'Did you guys ask if he wanted lunch?' or this or that and my sisters hate that I do that. I do baby him, but I'm a maternal person."