The Stories of Siyavash, Hyppolytus and Joseph are well-known throughout the world. The plot of these stories is almost about the wife of a king or a dignitary falling in love with her stepson or adopted son. Because of the chastity and the loyalty to the father, the stepson does not respond to and is not trapped in his stepmother’s lust.Therefore, accusing the stepson of rape the woman tries to avenge him. She also deceives her husband to severely punish his son. (In some stories, the son falls in love with the stepmother or trapped in her fraud.) The present article tries to relate the various instances of this kind of love between stepmother and stepson in different mythological, literary, and historical texts of different nations and to compare these examples to find why such a plot is widespread throughout the world, and among various nations.

The Iranian and Indian people from long time till here have been accepted as two nations with common culture and common ideas. This issue brings with itself originality of both. Both of Ramayana and Sivash come to existence based on this common culture. One of exact and important common part in these stories is similarity of action and characters features. In this paper with descriptive and analytical approach we tried to lunch new analysis based on characters and their action. With this approaches we come to this goal that characters like Siavoosh and Ram in faithfulness and Soodabeh and Keieki in deceitfulness and jealousy and hostility with son and also Kavoos and Jesret in hesitancy and Give and Hanooman in braveness and loneliness in front enemy and passing the water and Afrasyab in authority and hostility and Frangis and Sita in tangle of enemy and Kikhosroo and Loo and Kash in the way of their home and also Valmici in wisdom are all as same as each other.