Actually Kourtney and Khloe are her real sisters. The other girls are her step-sisters.
"Kardashian has two sisters, Kourtney and Khloe, and one brother, Robert. She also has stepbrothers Burton Jenner; Brandon Jenner; and reality TV star Brody Jenner; stepsister Casey Jenner; and half-sisters Kendall and Kylie Jenner."
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