Derek (Michael Seater) and Casey (Ashley Leggat) are back and continue their hilarious sibling rivalry during a family vacation to visit their grandmother, Felicia (Kate Trotter) at her beautiful lakefront lodge. Things heat up with Casey when she meets Jesse (Nico Archambault), a handsome young dancer who is a waiter at the lodge. Meanwhile, as Derek is "chilling" on his vacation, he falls for Roxy (Kristen Gutoskie), the rich girl who lives across the lake. But when Roxy’s father, a greedy land developer, threatens to destroy the natural beauty around them, the McDonald-Venturi kids band together to save the lake and the lodge.