Best friends sister (Brandon w Gross)

Cynthia castee and her sister McKenzie Had just moved back to California and their living with their older brother elton until they can get everything settled after they settle in Elton takes them to meet his friends who invite them to a trip for 25 weeks with adventures like holding hands with spirits to opening one of the worlds most haunted items they accept the invite and Are introduced to the rest of the group where Cynthia meets a certain guy who will end up changing her world for the better but what happens when this guys turns out to be one of her brothers bestfriends, and what happens when McKenzie finds herself stuck in a love triangle with a certain parkour athlete and a dancer, will elton allow this or will it take some convincing?? And what's gonna happen between McKenzie corey and corbin