The youngest son is a stock character in fairy tales, where he features as the hero. He is usually the third son, but sometimes there are more brothers, and sometimes he has only one; usually, they have no sisters.

A fairy tale is a short story that belongs to the folklore genre. Such stories typically feature magic, enchantments, and mythical or fanciful beings. In most cultures, there is no clear line separating myth from folk or fairy tale; all these together form the literature of preliterate societies. Fairy tales may be distinguished from other folk narratives such as legends and explicit moral tales, including beast fables. Prevalent elements include dragons, dwarfs, elves, fairies, giants, gnomes, goblins, griffins, merfolk, monsters, talking animals, trolls, unicorns, witches, wizards, magic, and enchantments.