When Red and her Tethered family descend upon Adelaide's home the first night of their holiday, the movie swerves into the home invasion thriller genre. Seeing the evil doppelgangers terrorize both the Wilsons, as well as Josh and Kitty's family, is tense and horrifying in a myriad of ways, and I couldn't help but be reminded of the demented killers in Funny Games (both the 1997 and 2007 versions).
In both versions of the film, two initially unassuming men show up at the lakeside holiday home of a family one evening and proceed to take them hostage and torture them throughout the night. At one point someone's leg is shattered with a golf club.
Coincidentally, when Zora (Shahadi Wright Joseph) enters Josh and Kitty's home to try to save her mother — who is dragged inside and held hostage by Kitty's Tether — her weapon of choice is a golf club. She uses it to beat one of the twin's evil doppelgangers to death, and also attacks Kitty's double with it.