The Husaynids are a part of the Alids and are descendants of Husayn ibn Ali who is the grandson of Muhammad. They and the Hasanids form the two main branches of the Alid family.

Family tree

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Muhammad
(Islamic prophet and messenger)
Khadijah bint Khuwaylid
FatimahAli
(1st Imam in Shia) (Rashidun Caliph in Sunni)
Muhsin ibn AliHasan ibn Ali
(Sunni Rashidun Caliph)
(Imam in Twelver/Zaidi and Musta'li Shia)
Husayn ibn Ali
(Imam in Twelver/Zaidi and Musta'li/Nizari Shia)
Umm Kulthum bint AliZaynab bint Ali
ShahrbanuRubab bint Imra al-QaisLayla bint Abi Murrah al-ThaqafiUmm Ishaq bint Talhah
Fatima SughraSakinah bint HusaynAli al-Asghar ibn HusaynSukayna bint HusaynAli al-Akbar ibn HusaynFatimah bint Husayn
Mother of ‘UmarAli ibn Husayn Zayn al-Abidin
4th Twelver/Zaidi and 3rd Musta'li/Nizari Imam
Fatimah bint HasanJayda al-SindhiAli al-Akbar ibn Husayn
‘Umar al-AshrafMuhammad al-Baqir
5th Twelver and 4th Musta'li/Nizari Imam
Umm Farwah bint al-Qasim
(Umm Farwa)
Zayd ibn Ali
5th Zaidi Imam
Ali al-Asghar ibn Husayn
‘AlīHamidah KhatunJa'far al-Sadiq
6th Twelver and 5th Musta'li/Nizari Imam
Fatima bint al-Hussain'l-Athram ibn al-Hasan ibn AliZaynab bint Husayn
al-ḤasanMusa al-Kadhim
7th Twelver Imam
Abdullah al-AftahIsma'il ibn Ja'far
6th Musta'li/Nizari Imam
UnknownUmm Kulthum bint Husayn
‘AlīUmmul Banīn Najmah
al-Nāṣir al-KabīrAli al-Ridha
8th Twelver Imam
Sabīkah a.k.a. KhayzurānMuhammad ibn Isma'il
7th Sevener/Musta'li/Nizari Imam
Fatima
SumānahMuhammad al-Jawad
9th Twelver Imam
UnknownAhmad al-Wafi
8th Musta'li/Nizari Imam
Other issue
Ali al-Hadi
10th Twelver Imam
Hâdise (Hadīthah) / Suzan (Sūsan) / Sevil (Savīl)Other issueMuhammad at-Taqi
9th Musta'li/Nizari Imam
Unknown
Hasan al-Askari
11th Twelver Imam
NarjisRadi Abdullah
10th Musta'li/Nizari Imam
Muhammad al-Mahdi
12th Twelver Imam