Explanation

Muhammad bin Qasim belonged to the Banu Thaqif.

Muhammad Bin Qasiim was a close relative of Hajjaj bin Yousuf,

He was the son-in-law of Hajjaj bin Yousuf

Because of him, he was appointed the governor of Persia 

Hajjaj ibn Yusuf was the governor of the Umayyad Caliphate from 692–694

Additional information 

Muhammad ibn Qasim led the Muslim conquest of Sindh

From Raja Dahir in the battle of Aror.

He was the first Muslim to have successfully captured Hindu territories

And initiated the early Islamic India in 712 AD.