In An Instant (2015)

S5E19 The Hatrocks and the Gruesomes

Fred is anxious about a visit from his hillbilly cousins, with whom his older relatives had a longstanding feud. Initially, the stay goes surprisingly well, and everyone seems to get along. However, the mood shifts when Fred and Wilma come to the unsettling realization that their guests have no intention of leaving anytime soon.