Well-Wisher...
Well-Wisher: My ancestral line reaches the Prophet through Imam Musa Kazim as follows: Muhammad, son of ‘Ali Akbar (Ashrafu'l-Wa’adhim), son of Isma'il Mujtahidal-Wa'iz, son of Ibrahim, son of Salih, son of Abi ‘Ali Muhammad,son of ‘Ali (known as Mardan), son of Abi'l-Qasim Muhammad Taqi, son of (Maqbulu'd-din) Husain, son of Abi ‘Ali Hasan, son of Muhammad ibn Fathullah, son of Ishaq, son of Hashim, son of Abi Muhammad, son of Ibrahim, son of Abi'l-Fityan, son of Abdullah, son of Hasan, son of Ahmad (Abu Tayyib), son of Abi ‘Ali Hasan, son of Abu Ja'far Muhammad al-Hairi (Nazil al-Kirman), son of Ibrahim Az-Zarir (knownas Mujab), son of Amir Muhammad al-Abid, son of Imam Musa Kazim, son of Imam Muhammad Baqir, son of Imam ‘Ali Zainu'l-Abidin, son of Imam Husain, son of the Commander of the Faithful, ‘Ali binAbi Talib.
Hafiz: This line of descent reaches the Commander of the Faithful, ‘Ali (may Allah bless him) although you have said that it ends with the Holy Prophet. Infact, with this genealogy, you should call yourself among the relations of the Holy Prophet and not among his direct descendants. A descendant is one who is directly linked with the Prophet. Well-Wisher: Our ancestral line reaches the Prophet through Bibi Fatima Zahra, the mother of Imam Husain.
I don't understand why you insist so much on this point. Hafiz: I think I am misunderstood. It is my point of view that descent is recognized from the male side only. I quote an Arabic couplet: "My sons, grandsons, and daughters are from me, but my daughter's sons are not from me." If you can prove otherwise, please do so. Well-Wisher: There is strong evidence, both from the Holy Qur'an and from authentic hadith, to establish my point. Hafiz: Please relate it so that we may understand.
Well-Wisher: While you we’re speaking just now, I recalled a discussion between Harun ar-Rashid, the Abbasid caliph, and our Imam Musa Kazim on this topic. The Imam gave such a convincing reply that the caliph himself accepted it. Hafiz: I would like to hear about that discussion. Well-Wisher: Abu Ja'far Muhammad Ibn ‘Ali, entitled Sheikh Saduq, in the fourth century A.H.
inhis Uyun al-Akbar ar-Riza (Major Sources for Riza), and Abu Mansur Ibn ‘Ali Tabarsi, in his Ehtijajj (Supports) give a detailed account of the conversation that took place between Harun ar-Rashid and Imam Musa Ja'far in the caliph's court. The caliph asked the Imam,"How can you claim that you are a descendant of the Holy Prophet?