The misadventures of a South Shore dynasty returns Sundays on CBC and CBC Gem. When it comes to telling the story of a dysfunctional family that’s also financially messy, Jennifer Finnigan says Moonshine—the one-hour CBC dramedy in which she stars—has a lot to add to the canon: “I can't compare our show to anything, really. Yes, there's sort of quirky elements of Arrested Development and Schitt’s Creek, absolutely…