Stan’s great nieces stepped into the mystery shack, a tourist trap that was also his household that was located in the not exactly well known town, gravity falls. The kids were staying there for the summer because they were getting into trouble at school.

"Great uncle Stan?" The boy, mason (nicknamed dipper, after his birthmark) called out. Stan could hear their voices in the next room. "Grunkle Stan!" Dipper: "Grunkle?" Mabel: "Yeah." Dipper: "It’s dumb." Mabel: “You’re dumb."