Question: Who is the mother of the head of the House of Saud?

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Faisal bin Turki Al Faisal Al Saud: Faisal bin Turki Al Faisal Al Saud (born 27 March 1975), titled Prince Faisal bin Turki Al Faisal Al Saud, most commonly referenced as Faisal bin Turki.  He is the eldest son of Prince Turki bin Faisal Al Saud and brother of Red Bull athlete Prince Abdulaziz.  He is a member of the House of Saud, the Saudi Arabia royal family.  Similar to his father, Prince Faisal bin Turki studied International Relations at the Edmund A. Walsh School of Foreign Service at Georgetown University.  Faisal also studied at Calvin College, American Intercontinental University and the London School of Economics and Political Science, obtaining an MSc in Environmental Policy Planning and Regulation.

Unification of Saudi Arabia: The unification of Saudi Arabia was a military and political campaign, by which the various tribes, sheikhdoms, emirates, and kingdoms of most of the Arabian Peninsula were conquered by the House of Saud, or "Al Saud", between 1902 and 1932, when the modern-day Kingdom of Saudi Arabia was proclaimed under the leadership of Ibn Saud, creating what is sometimes referred to as the "Third Saudi State", to differentiate it from the Emirate of Diriyah, the "First Saudi State" and the Emirate of Nejd, the "Second Saudi State", also House of Saud states.

Hussa bint Ahmed Al Sudairi: Hussa bint Ahmed Al Sudairi (1900–1969) was one of King Abdulaziz many spouses and the mother of King Fahd and King Salman, monarchs of Saudi Arabia.

Muhammed bin Saud Al Saud: Mohammad bin Saud bin Abdulaziz Al Saud (21 March 1934 – 8 July 2012) was a member of the House of Saud.  He was the only son of King Saud to hold high office after his father's deposition.  Later, another son of King Saud, Mishaal bin Saud, became the governor of Najran Province.

Abdulaziz bin Saud Al Saud: Abdulaziz bin Saud bin Nayef bin Abdulaziz Al Saud (Arabic: عبد العزيز بن سعود بن نايف بن عبد العزيز آل سعود‎ ‎ ; born November 4, 1983) is the Minister of Interior of Saudi Arabia since 21 June 2017.  Prince Saud is a graduate of the Dhahran Ahliyyah School and King Saud University.  After King Salman came to power, Abdulaziz was appointed as an adviser to the Royal Court in various departments and later served as an adviser in the Defense Ministry.  He is the eldest son of Prince Saud bin Nayef (former Head of the Saudi Crown Prince Court) who is the eldest son of the former Crown Prince Nayef bin Abdulaziz.

Ikhwan Revolt: The Ikhwan Revolt began in 1927, when the tribesmen of the Mutayr and Ajman rebelled against the authority of Ibn Saud and engaged in cross-border raids into parts of Trans-Jordan, Mandatory Iraq and the Emirate of Kuwait.  The relationship between the House of Saud and the Ikhwan deteriorated into an open bloody feud in December 1928.  The main instigators of the rebellion were defeated in the Battle of Sabilla, on 29 March 1929.  Ikhwan tribesmen and troops loyal to Abd al-Aziz Ibn Saud clashed again in the Jabal Shammar region in August 1929, and Ikhwan tribesmen attacked the Awazim tribe on 5 October 1929.  Faisal al-Dawish, the main leader of the rebellion and the Mutair tribe, fled to Kuwait in October 1929 before being detained by the British and handed over to Ibn Saud.  Faisal Al-Dawish would die in Riyadh on 3 October 1931 from what appears to have been a heart condition.  Government troops had finally suppressed the rebellion on 10 January 1930, when other Ikhwan rebel leaders surrendered to the British.  In the aftermath, the Ikhwan leadership was slain, and the remains were eventually incorporated into regular Saudi units.  Sultan bin Bajad, one of the three main Ikhwan leaders, was killed in 1931, while al-Dawish died in prison in Riyadh on 3 October 1931.

Bandar bin Saud bin Abdulaziz Al Saud: Prince Bandar bin Saud bin Abdul Aziz Al-Saud (Arabic: الأمير بندر بن سعود بن عبد العزيز آل سعود‎ ‎ 2 January 1926 – 17 March 2016) was the eighth son of King Saud bin Abdul Aziz Al Saud of Saudi Arabia.  He was born on the same day his grandfather, King Abdul Aziz, entered and joined the city and province of Qunfudah to his realm.  Prior to his death, he was the eldest surviving member of the ruling branch of the House of Saud.

Salman bin Abdulaziz bin Salman Al Saud: Salman bin AbdulAziz bin Salman bin Muhammad bin Saud bin Faisal (Arabic: الأمير سلمان بن عبد العزيز بن سلمان بن محمد بن سعود بن فيصل, Salmān bin ʿAbd al-ʿAzīz bin salman ʾĀl Saʿūd) (born 1980) is a member of the Saudi royal family.  His mother is Princess Nouf Bint Abdullah bin Abdul Rehman al Saud and father is Prince Abdulaziz bin Salman bin Muhammad Al Saud.  His grandfather is Salman bin Muhammad bin Saud.

Bader bin Saud bin Mohammed Al Saud: Prince Bader bin Saud bin Mohammed bin Abdulaziz bin Saud bin Faisal bin Turki Al Saud (born 27 November 1969), is a Saudi Public Affairs Writer under the nom de plume Bader bin Saud, Paratrooper Colonel at the Saudi Arabian Ministry of Interior, and previously president of the Saudi Students Clubs in the UK & Ireland.  He is now the Deputy Commander of the Public Security Training City in Al Madinah Region, Kingdom of Saudi Arabia.  His father is Prince Saud bin Mohammed Al Saud, and his mother Princess Alanoud bint Abdullah bin Abdulmohsen Alfirm.  Two of his siblings are known poets, Prince and Dr Saad Al Saud, known as “Munadi,” (the caller).  The other is Prince Abdulaziz bin Saud Al Saud, known as “Alsamir”, (the one who stays up all night) Prince Bader has six children - Prince Faisal, Prince Saud, Prince Khalid, Prince Fahad, Princess Reem and Princess Aljohara.

Salman of Saudi Arabia: Salman bin Abdulaziz Al Saud (Arabic: ‎ ‎ , "Salmān ibn ‘Abd al-‘Azīz Āl Sa‘ūd "; born 31 December 1935) is King of Saudi Arabia, Custodian of the Two Holy Mosques, and head of the House of Saud.

Supporting paragraphs: Hussa bint Ahmed Al Sudairi Salman of Saudi Arabia
Answer: Hussa bint Ahmed Al Sudairi