Waiting for the Light (1990)

It is not about Aunt Z moving her niece and family....The niece, Garr, moves her family away from the city. The kids enjoy playing tricks, learned from Aunt Z (MacLaine). The kids get kicked out of school one too many times and after inheriting the diner, they move. Garr promises them if they don't quit embarrassing her with their foolishness, she will put the kids in separate orphanages and MacLaine in a mental institute!. All turns out well.