Back in the late 90s or early 00's I saw this movie about a teen girl, a sister that turns her small brother to a pig with some magic trick or some curse. I think they go to a witch but no helps a lot o she tells them they have to go somewhere to break the curse. For some reason I believe they have to go to Mexico to undo the curse. I think the cast was all white.
This is My Brother the Pig (1999)
A boy named George is magically transformed into a pig. In a dangerous and crazy adventure, the boy, his sister, Kathy, his best friend Freud, and their housekeeper Matilda leave for Mexico to try to undo the witchcraft before their parents return from their Paris trip.