Katie Knight (Ciara Bravo)Nine-year-old Katie Knight (Ciara Bravo) is Kendall's little sister. She lives with her older brother and her mother in the Palm Woods Hotel. A little wise beyond her years, Katie enjoys blackmailing people and likes to gamble. Although she is Kendall's younger sister, James, Carlos and Logan are also very protective of her and view her as their little sister too. The boys often rely on Katie for their crazy schemes since she is very clever and conniving. She has a knack for manipulating people to get what she wants but, underneath all the scheming, is a very sweet girl. Always a bit of a troublemaker, Katie doesn't seem to have many friends her age.