The article proposes an analysis of traditional folklore texts with regard to the motif of incest between sister and brother. The author points out that although the title motif is occasionally referred to explicitly, its veiled forms seem to occur almost universally, especially in folklore prose. At the same time references to incest symbolism can also be found in specific ritual situations. The author argues that the popularity of this motif is a reverberation of old mythological images stemming from a marriage between siblings.Artykuł przynosi analizę tradycyjnych przekazów ludowych w perspektywie uobecnianego w nich motywu kazirodztwa między siostrą i bratem. Autor zwraca uwagę, że jakkolwiek tytułowy motyw sporadycznie jest przywoływan...