Not Exactly What They Seem

Ravan never really liked her Great-Uncle Stan. He was snobby, with two kids named Dipper and Mabel, also his grand-neice and nephew. She had never met them, but if they lived with Stan, then they must be stuck-up and shallow also. But, one fateful day, Ravan's mother decides that she should go visit them at Gravity Falls for the entire summer.
{Reverse Falls AU}