All of his twelve sons held important offices in the Seljuk Empire, the most prominent of his sons were; Ahmad ibn Nizam al-Mulk, served as the vizier of the Seljuq Sultan Muhammad I Tapar and the Abbasid caliph al-Mustarshid; Shams al-Mulk Uthman was the governor of Merv and head of the Seljuk military; Fakhr al-Mulk served as the vizier of Barkiyaruq and Muhammad I Tapar; Jamal al-Mulk (who died before Nizam) served as the governor of Balkh; Izz al-Mulk and Mu'ayyid al-Mulk served as the vizier of Barkiyaruq; Imad al-Mulk Abu'l-Kasim served as the vizier of the Seljuq governor of Balkh.