While it can be classified as a folk tale due to its origins in oral tradition, it is often categorized as a fairy tale because of its fantastical elements, such as:
* Magical objects: The magic ring that helps the hero find his sisters
* Supernatural beings: The king and queen who are transformed into animals
* Hero's journey: The hero must overcome obstacles to save his family
The story is also often classified as a tale of the type 450, according to the Aarne-Thompson classification system, which identifies specific narrative motifs. This type, commonly referred to as "The Maiden Who Seeks Her Brothers," is characterized by a woman's search for her brothers who have been abducted or lost.
It's important to note that the term "fairy tale" itself can be somewhat broad, and different interpretations exist. While "Seven Daughters and Seven Sons" fits the typical characteristics of a fairy tale, its classification may vary depending on the specific context.