The 21-year-old model joked that the first thing she would steal from her older sister is her three kids, Mason, Penelope and Reign but admitted she would be happy to give them back at the end of the day as they can be exhausting.
She wrote on her website kendallj.com: "First up on my list are Kourtney's kids! P, Mason and Reign are the cutest, and I love hanging with them. They do the funniest things. But, little kids are a handful and I may want to give them back at the end of the day, lol."
And Kendall would also like to steal some of fashionable Kourtney's accessories.
Speaking about her 37-year-old sister's boot collection, Kendall said: "Kourt has the best collection of thigh-high boots. I'm sure she wouldn't mind if I 'borrowed' a few."