The Duckling with Golden Feathers
A Latvian tale, this version is taken from the 1938 anthology Wonder Tales from Baltic Wizards by Frances Jenkins Olcott.
Once on a time two King’s children, a brother and a sister, lived with a hateful woman. She ill-treated the two children, though she loved her own daughter who was both dirty and ugly.
One day the two children said to each other, “Let us go away.”
So they went and went, till they reached a crossroad, and there they parted with many tears. The brother took with him a portrait of his sister to remember her by, and started on his way.