According to the majority of Shī'a, namely the Twelvers (Ithnā'ashariyya), the following is a listing of the rightful successors to Muḥammad. Each Imam was the son of the previous Imam except for Hussayn ibn 'Alī, who was the brother of Hassan ibn 'Alī.The belief in this succession to Muḥammad stems from various Quranic verses which include: 75:36, 13:7, 35:24, 2:30, 2:124, 36:26, 7:142, 42:23.[citation needed] They support their discussion by citing Genesis 17:19–20 and Sunni hadith:Sahih Muslim, Hadith number 4478, English translation by Abdul Hamid Siddiqui.[original research?]
Usually, how has each Imam been related to the previous Imam?
son