Big Sister: Kendall, 16 (And a whole slew of Kardashian half-siblings)
The Jenner sisters may only be a year apart, but when it comes down to the roles in this sisterhood, big sis Kendall treats her little sister, Kylie, like a daughter. "She [acts] like [she's] my mom, I swear," Kylie told Teen Vogue. "This morning, she walks in and goes, 'Make sure you're up.' I'm like, 'Kendall, I'm up! I get it.'" And it seems as if Kylie aspires to be just like her older sister, who has been working as a model. Kylie just walked it out on the catwalk in Avril Lavigne's Abbey Dawn spring/summer 2013 fashion show.