Television Series
Kate Randall is Hanna Marin's soon to be stepsister. she was introduced in episode 4 Can You Hear Me Now? she seems to be someone who is poised and well brought up. it is also mentioned she is good at sailing.
Book Series
Kate Randall is Hanna Marin's stepsister. They have a big sibling rivalry that went on since their parents got together. they fight over almost everything especially for their fathers affection where she always gets the upperhand. They also fought over Mike Montgomery where Hanna Dated Mike to get back at Kate but it turned out that Kate only pretended to be interested in Mike to see how far Hanna would go.