When 17 yr/old Kailee Stone gets help, she discovers who her real parents are. So when she arrives at the Mendes' house, she is very surprised to know that she is Shawn Mendes' sister. But will she fall in love or hate on of the Magcon boys? Jack Gilinksy is shocked to see that Shawn, who was he closest friend besides JackJ, had never told him about his sister and wonders how long he had known. But will he fall in love and accept her for her, or will he despise her and her past.