Many of the adventures the babies find themselves in take place at Tommy's house; the parents usually rely on Didi, Stu, or Grandpa Lou to babysit the kids while they run errands. Their address is revealed on an invoice in "Tommy's First Birthday" (season one, 1991) as 1258 N. Highland, the original address of Klasky Csupo in Los Angeles. However, an unnamed specific city or state is never mentioned in the show. Several indicators, such as a state flag at a post office, license plate designs on the vehicles, and various trips to the Grand Canyon, Las Vegas, and the beach, place the characters somewhere in southern California. The location is also hinted at during "Little Dude" (season one, 1991) when Didi, who is a teacher, takes Tommy to her class at Eucaipah High School, referencing the city of Yucaipa, California. It has been implied that this ambiguity was done intentionally to help give the impression of seeing the world through the eyes of the babies, who would not understand the concept of location. The DeVilles live next door to the Pickles and, early in the series, the Carmichaels move in across the street.