Contrary to its similarities with other Iranian ethnicities’ marriage ceremonies, the marriage ceremony in Hormozgan province has differences with them in respect of ceremonies and their procedures. One of these differences is reading Basenaks in various steps of marriage by men and women. Of course women’s frequencies are much higher than men’s counterparts. The present article has been devoted to content analysis and has been done through objective observations and interviews done for investigation of Basenaks and the role of sister– in – Law in marriage ceremony’s Basenaks of Hormozgan and it has been cleared that Hormozgan Basenaks belong mostly to religious types and are read by groom & bride’s relatives. Among audiences of Basenaks are sister and mother of the sister – in – Law. The results of this study show that the role of sister– in – law in Marriage Ceremony’s Basenaks is more prominent. However, the mother attends Basenaks when there appears shortages in the ceremony in a humorous way. The present article studies the role of sister– in – law in Marriage Ceremony’s Basenaks. It is worth mentioning that because of oral and popular characters of Basenaks, there is always the problem of rhyme and meter in Basenaks.