Masoud Khamenei
Masoud Hosseini Khamenei, also known as Mohsen Khamenei, is an Iranian Twelver Shia cleric who is the third son of Iran's supreme leader, Ali Khamenei; and is the brother of Mostafa, Mojtaba and Meitham. Khamenei also has the title of "Hujjatul-Islam", and is the husband of Sadiq-Kharazi's sister; likewise, he is the son-in-law of Seyyed Mohsen Kharazi. Seyyed Masoud is studying and teaching in the seminary of Qom; and is a member in Society of [Seminary Teachers of Qom].
Seyyed Masoud doesn't have governmental/non-governmental or formal position; moreover, his father has prohibited his son from accepting governmental, or similar positions. According to Mehr [News Agency]: Seyyed Masoud has the most attention—between Iran's supreme leader's sons—in collecting the memoirs of his father and likewise in running the office of the preservation and publication of Iran's supreme leader works.