Gravity Falls: Reversed Dreams... Or Nightmares

Dipper Pines was the son of Stanley Pines and helped run the very successful Mystery Shack with his Father and uncle Stanford, who insisted on him calling him 'Grunckle Stan'. Then a month before summer, Dipper's father got married to the great granddaughter of the town's founder, Jenny Northwest. Jenny and her daughter, Mabel Northwest who looked surprisingly a lot like Dipper, moved in with them and Stanley took on the name of Northwest.

Gideon Gleeful lived with his father, Bud, that was obsessed with money and his cousin, Pacifica N. Gleeful, who liked shiny stuff. He helps run the giant tourist trap called 'The Tent O' Telepathy'... Worst part was that it wasn't even a tent.

A slightly different version of the Reversed Falls AU.