Ali (RAA) had a few wives, after Fatimah but she is the most beloved. He had four children from her: Hassan, Husayn, Zaynab and Umm Kulthum. His others sons were born from Fatima Binte Hizam(Um Al-Banin).
Hassan was born in 625 AD. He is the second Shi’a Imam. He was killed by a member of his family in 50 AH.
Husayn was born in 626 AD. He was the third Shi’a Imam. He was killed in the Battle of Karbala, where other people from Ali’s family where killed included the four sons of Fatima Binte Hizam.