"Brother and Sister" is a Greek fairy tale collected by Georgios A. Megas in Folktales of Greece.
Once, when work let the brother buy some sardines, he gave them to his sister to keep for their evening meal.
The king was enraged; he threw the brother into prison and sent the gypsy to mind the turkeys.
The sister, as a bird, flew into the king's garden and sang of her story.
The king freed her brother, married her, and had the gypsy torn to pieces.