Seyyed Masoud Hosseini Khamenei (Persian: سید مسعود حسینی خامنهای), also known as "Seyyed Mohsen Khamenei" (Persian: سید محسن خامنهای),[1][2] 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;[3] likewise, he is the son-in-law of Seyyed Mohsen Kharazi[4][5][6] (Tehran’s representative in the assembly of experts). Seyyed Masoud is studying and teaching in the seminary of Qom; and is a member in Society of Seminary Teachers of Qom (Persian: جامعهٔ مدرسین حوزهٔ علمیهٔ قم).[7]
Seyyed Masoud[8] doesn’t have governmental/non-governmental or formal position; moreover, his father (Seyyed Ali Khamenei) has prohibited his son(s) from accepting governmental, or similar positions.[9] According to Mehr News Agency:[10] 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.[11]
The family (ancestors) of Seyyed Masoud Khamenei are among the Iranian Sayyid families[12][13] who are from Hosseini Sayyid,[14] and their lineage is connected to the fourth ImamofShia Islam, Ali ibn Husayn Zayn al-Abidin (Persian/Arabic: علی بن حسین، زین العابدین) (known as "Imam Sajjad")[15][16][17] -- according to "Khamenei family tree".[18][19]