Kylie Mercer is a computer savant and Alec's sister on "The Irrational." While Alec lives to work, Kylie works to live. With her skill set and tech knowledge, Kylie can make a lot of money whenever she wants to, but she only does this to fund her passion for travel, her social life and her many lit looks. Kylie is the life of any room she walks into. She has an easy charm and a great sense of humor, and she is fiercely and fabulously exactly herself at all times. Kylie is very close to Alec. He helped raise her, and even though they are very different people, they've never lived more than five miles from each other. In many ways she's the person Alec can trust most, and she's definitely the best at calling Alec out when he needs some sisterly grounding.