His brother Abd Allah ibn Hurmuz was a chief of the Umayyads' mawali in Kufa during the reign of Yazid I's father, Caliph Mu'awiya I (r. 661–680).
He was possibly tasked with helping enforce tax collection and later oversaw the army registers of Iraq under the Umayyad governor, al-Hajjaj ibn Yusuf (r. 694–714).
[1] During the Second Muslim Civil War (680–692), the people of Medina rebelled against Caliph Yazid, and the latter dispatched an expeditionary force from Syria to suppress the Medinese.
The latter assaulted this part of the trench and called on Yazid ibn Hurmuz to surrender, but his forces held the Syrians off.
[3] His son Abu Bakr Abd Allah al-Asamm (d. 765) was a faqih and transmitter of hadiths in Medina who a key supporter of the anti-Abbasid rebel Muhammad al-Nafs al-Zakiyya.