What is the name of Hassan Khomeini's grandfather
Ruhollah Khomeini Sayyid Ruhollah Mūsavi Khomeini (Persian: سید روح‌الله موسوی خمینی‎ ‎ ] ; 24 September 1902 – 3 June 1989), known in the Western world as Ayatollah Khomeini, was an Iranian Shia Muslim religious leader, philosopher, revolutionary, and politician. He was the founder of the Islamic Republic of Iran and the leader of the 1979 Iranian Revolution that saw the overthrow of the 2500 years of Persian monarchy and Mohammad Reza Pahlavi, the last Shah of Iran. Following the revolution, Khomeini became the country's Supreme Leader, a position created in the constitution of the Islamic Republic as the highest-ranking political and religious authority of the nation, which he held until his death. He was succeeded by Ali Khamenei on 4 June 1989.
Muhammad Hossein Naini Mohammad Hussein Naini Qaravi (Persian: محمد حسین نائینی غروی‎ ‎ ) was Iranian Twelver Shia Marja'. His father Mirza Abdol Rahim and grandfather Haji Mirza Saeed, both one were Sheikhs of Nain and Mohammad Hussein proved himself the most competent student of Ayatollah Kazem Khorasani. Ayatollah Naini is considered to be the most famous theoretician of Iran’s Constitutional Revolution. He died in 1936 and was buried next to shrine of Imam Ali in Iraq. Among his works, notable references are his Dubios Habit, Vassilat'un Nijat, and Ressalat la Zarar. 50th death anniversary of Ayatollah Mirza Mohammed Hussein Naini was memorialized by issue of Stamps Tickets, in Iran, in 1987.