I cannot remember if we mentioned this in class, but Timur’s wife, Saray Mulk Khanum, was a Chagatai princess and a direct descendant of Genghis Khan. Also, she did not have any children with Timur, and Husayn was actually her previous husband, killed by Timur. I can see how her royal status could have led to the influence she had, even if she did not have any children with Timur.

https://www.ebsco.com/research-starters/history/bibi-khanum-mosque

https://en.wikipedia.org/wiki/Saray_Mulk_Khanum