The Devil in My Sister-in-Law

Ian Shaw dreams his deceased grandfather warns him: if a goat comes to their door, he must kill it, or disaster will follow. At his brother's wedding, sister-in-law Sylvia brings a white goat, claiming it's 'divine' for Ian's life extension. Ian and his mother decide to kill the goat, secretly swapping it. They learn Sylvia was deceived by a wandering sorcerer and recovered. The family has since stayed away from superstition.