My Brother the Pig (1999) on Netflix

Plot summary

Kathy is a teenager whose younger brother George never stops playing practical jokes on her. George is eight years old. Their parents leave for a trip to Paris, and the children are left with their nanny, Matilda. Ancient rocks belonging to Matilda trigger a spell that turns George into a pig. Kathy, George, his best friend Freud, and Matilda set out for Mexico to find a way to reverse the spell before the parents return. Matilda's grandmother, Berta, is the person they seek in Mexico, because she can undo the witchcraft. The group needs to gather the ingredients for Berta's cure.