The importance of family —the one you're born into and the one you make for yourself — has been a central theme on MTV's Teen Wolf since the show premiered in 2011.

Onscreen, Scott McCall (Tyler Posey) defends his mother (Melissa Ponzio) and his makeshift family — currently comprising Scott's mortal BFF Stiles Stilinski (Dylan O'Brien), banshee Lydia Martin (Holland Roden), werecoyote Malia Tate (Shelley Hennig), kitsune Kira Yukimura (Arden Cho), and newly turned werewolf Liam Dunbar (Dylan Sprayberry) — from a myriad of supernatural creatures trying to take control of his town, Beacon Hills.

But offscreen, a more sizable tribe has taken shape thanks to the show's long hours and late nights — and sitting atop that makeshift family tree are its patriarchs: Tyler Posey and Dylan O'Brien. "They are the epitome of what 'One' and 'Two' are supposed to be," Hennig told BuzzFeed News, referring to their place on the show's callsheet of actors. "They're so much fun, but they're professional and get the job done. They've been here for five seasons and they're still doing homework. They're not phoning it in. They keep everyone on their toes, and that's something I really appreciate."

The burden of establishing and maintaining an enjoyable atmosphere is one Posey happily bears, mostly because he is well acquainted with the alternative. "I worked on other shows before this where the lead actor hasn't been that cool," he told BuzzFeed News during a March visit to the Teen Wolf set in Van Nuys, California. "It stresses out the set and sets a bad tone. So I've just tried to alleviate all of that, and it makes me feel good." And since Teen Wolf is O'Brien's first job, it has a "really special" place in his heart. "I love my character and I love our family here," he said.